2027 Mizuno CRBN1 and CRBN PRO Fastpitch Bats: Models, Drop Weights and Who Should Swing Them

Mizuno's fastpitch lineup has a fresh look for 2027, and two bats are getting most of the attention: the one-piece F27 CRBN1 and the two-piece CRBN PRO. If you've spent any time around travel ball or watched college softball on TV, you already know the CRBN name. These are the bats with the loud, unmistakable crack that turns heads two fields over.

We're the Bat Performance Experts at LongballBats.com, and we've been matching fastpitch hitters with the right bat since 2016. This guide covers everything we know so far about the 2027 Mizuno CRBN1 and CRBN PRO fastpitch softball bats: how they're built, which drop weights and sizes they come in, what changed from the last generation, which stamps they carry and which hitter belongs with which bat. Players, parents and coaches, this one's for you!

Why the Mizuno CRBN1 Is All Over College Softball

Here's a stat that surprises a lot of people. When Bat Digest tallied the bats it spotted at the 2023 Women's College World Series, the Mizuno CRBN1 showed up more than any other model. They counted 21 of them, nearly double the next bat on the list. An earlier CRBN1 generation made their most-seen list too.

Think about what that means! Mizuno outfits a lot of college programs, and those hitters can pull anything they want from the catalog, including the pricier two-piece models. A big share of them grab the one-piece CRBN1 anyway. College hitters swing hard and square the ball up often, and a stiff one-piece composite rewards that kind of swing with a direct, connected feel off the barrel.

Sponsorships shape what you see on TV, sure. But nobody playing in Oklahoma City in June is swinging a bat she doesn't trust. That's the reputation the 2027 model inherits, and it's why the CRBN1 is one of the most popular bats in the college game.

2027 Mizuno F27 CRBN1: The One-Piece

The F27 CRBN1 is a one-piece, all-composite fastpitch bat with a 2-1/4 inch barrel and a balanced swing weight. One-piece means the bat is a single unit from knob to end cap, so there's very little flex. What you put into the swing goes into the ball, and your hands know right away whether you found the barrel.

Here's what Mizuno packed into it:

• X-Zone Technology: composite angles are adjusted in 10 zones along the barrel to stretch the sweet spot
• Double Wall barrel with Cylinder Seaming: consistent pop and durability across the hitting area
• Black Onyx Carbon: Mizuno's tough, lightweight carbon composite
• Enhanced AntiShock construction: built into the taper to take the sting out of mishits
• Optimized End Cap: adds to the sweet spot and that booming CRBN sound
• Speed-Helix Grip: comfortable and built to last

The 2027 CRBN1 comes in three drop weights:

• -11 drop (model 340704): 28 inch/17 ounce, 29/18, 30/19 and 31/20
• -10 drop (model 340701): 30 inch/20 ounce, 31/21, 32/22, 33/23 and 34/24
• -9 drop (model 340702): 32 inch/23 ounce, 33/24 and 34/25

It wears the new White-Pink Tetra colorway: a white barrel with pink-to-orange graphics and purple accents. It's a sharp looking bat!

2027 Mizuno CRBN PRO: The Two-Piece

The CRBN PRO is Mizuno's premium two-piece fastpitch bat. The barrel and the handle are both Black Onyx Carbon, built as separate pieces and joined at a connection. That connection is the heart of the bat! Mizuno's patented Dual Frequency Dampener uses two different materials to soak up vibration while keeping flex in check, so you get a smooth feel without a whippy, disconnected swing.

The barrel uses Paired Barrel Detonator COR, a double-wall design that improves energy transfer, keeps the swing weight low and produces a sound you won't confuse with anything else in the dugout. You also get Cylinder Seaming, the Speed-Helix Grip and a 2-1/4 inch barrel. The -10 carries a balanced swing weight for bat speed and control through the zone.

The drops and sizes mirror the CRBN1 exactly:

• -11 drop (model 340713): 28 inch/17 ounce, 29/18, 30/19 and 31/20
• -10 drop (model 340710): 30 inch/20 ounce, 31/21, 32/22, 33/23 and 34/24
• -9 drop (model 340711): 32 inch/23 ounce, 33/24 and 34/25

The 2027 look is Black-Pink Tetra: a dark barrel with pink and orange graphics, a matching gradient grip and purple accents.

Mizuno CRBN1 vs CRBN PRO: What's the Difference?

Same barrel diameter, same three drops, same size runs. So how do you choose? It comes down to feel.
The CRBN1 is stiff and direct. Barrel it up and you'll feel the ball jump. Miss toward the hands or the end cap and the bat will tell you about it, although the AntiShock taper softens the message. Hitters who like that honest feedback tend to love one-piece bats for life.

The CRBN PRO is smoother and more forgiving. The two-piece connection filters out vibration before it reaches your hands, which makes off-center contact a lot friendlier. That matters for developing hitters, and it matters on chilly mornings at an 8 a.m. bracket game.

The sweet spot tech differs too. The CRBN1 leans on X-Zone, while the CRBN PRO uses Paired Barrel Detonator COR. And there's the budget question: the CRBN1 comes in about $100 under the CRBN PRO, which makes it one of the best values in high-end fastpitch bats.

What Changed From the F24 CRBN1 and F25 CRBN PRO?

If you're swinging the last generation, here's how the new bats compare.

F24 CRBN1 to F27 CRBN1. The winning recipe carries over: one-piece Black Onyx Carbon, X-Zone, Double Wall and the Optimized End Cap. Mizuno calls out enhanced AntiShock construction on the new model, and the white, black and purple look gives way to White-Pink Tetra. The bigger news is the drop lineup. The F24 arrived in -10 and -9, with a -8 offered and a -11 added later. The 2027 CRBN1 has the -11, -10 and -9 together right out of the gate, in the same size runs as before. We haven't seen a -8 in the 2027 lineup.

F25 CRBN PRO to 2027 CRBN PRO. The construction story holds here too: two-piece Black Onyx Carbon, Detonator COR and the Dual Frequency Dampener. The Spiced Coral look is replaced by Black-Pink Tetra. The F25 came in -11, -10, -9 and -8. The 2027 CRBN PRO comes in -11, -10 and -9, and once again there's no -8 so far.

Mizuno refined these bats instead of reinventing them. With this track record, we'd have done the same. If you're a -8 hitter, give us a call and we'll help you find the right fit!

Which Bat and Which Drop Should You Swing?

Start with the drop weight, then pick the construction.

Ages 8 to 10. Most players this age do best with a 28 to 30 inch bat in a -11 to -13 drop, and 29 inch/18 ounce is the most popular size. That points straight to the -11 in either model.

Ages 11 to 13. Look at 30 to 32 inch bats in a -10 to -12 drop. The most popular size here is 31 inch/20 ounce, which is the longest -11 Mizuno makes in these bats. Stronger players in this group can step into a 30, 31 or 32 inch -10.

Ages 14 and up. High school and college hitters generally swing 32 to 34 inch bats in a -8 to -10 drop. The most popular high school sizes are 32 inch/22 ounce and 33 inch/23 ounce, and both are -10s. Stronger, more experienced hitters who can keep their bat speed with an extra ounce should look hard at the -9.

Now for the fun part: one-piece or two-piece?

Swing the CRBN1 if you're a strong hitter who squares the ball up consistently, you like to feel exactly where contact happened, or you want to swing what so many college hitters trust. Power hitters and line drive gap hitters tend to fall for this bat fast. It's also the pick for families who want elite performance without the top-shelf price.

Swing the CRBN PRO if you're a contact hitter or slapper who lives on bat control, a younger player still learning to find the barrel, or anyone who can't stand sting in the hands. It's the more forgiving bat of the two.

Still stuck? We'd love to give you our professional opinion! Contact us with your hitter's age, size, level and hitting style and we'll give you straight answers every time.

Certifications: Where Can You Swing Them?

Both the 2027 Mizuno CRBN1 and the 2027 CRBN PRO are approved for USA Softball (ASA), USSSA, NSA, ISA and WBSC/ISF play. That covers the overwhelming majority of travel ball tournaments and rec leagues in the country.

High school softball played under NFHS rules requires the USA Softball certification mark, which both bats carry. College softball works a little differently. The NCAA keeps its own approved softball bat list, and earlier generations of both the CRBN1 and CRBN PRO are on it. If you're buying for a college hitter, confirm the 2027 model number on the current NCAA list before game day.

One rule never changes: check with your league or tournament director before you buy. Sanctioning bodies update their lists, and it takes two minutes to be sure.

Why Buy Your 2027 Mizuno CRBN1 or CRBN PRO From LongballBats.com?

You can buy a bat from a lot of places. Here's why thousands of softball families buy theirs from us!

• We're the Bat Performance Experts. We've been in business since 2016, and our staff touts more than 100 years of combined baseball and softball experience. Bats are what we do all day, every day!
• You talk to real people. Call us at 336-618-7487 or send us an email. We'll ask about your hitter and recommend the bat that fits her, even when it's the less expensive one.
• Brand new, authentic bats. Every CRBN1 and CRBN PRO we sell is brand new and comes with Mizuno's one-year manufacturer's warranty.
• Free ground shipping. Orders ship free to the continental USA, and stock/untouched bats typically head out the door in 1 to 2 business days.
• ProMAX Heat Rolling is available on every bat. Our ProMAX Heat Rolling Process with Progressive Pressure is an option you won't find at the big box stores. We've performed it on tens of thousands of baseball and softball bats since 2016, and we've posted more than 55,000 video clips of our work on our YouTube Channel. If you want maximum performance and durability out of your new bat, this upgrade is a no-brainer!
• A reputation you can check. We're a BBB Accredited Business with an A+ rating.
• A massive selection. Baseball, fastpitch and slowpitch bats, plus a Rare Finds section full of sold out and discontinued models you thought were gone for good.

Contact us to get on our Launch List for these new Mizuno bats and you'll be among the first to know when your size is ready to ship.

2027 Mizuno CRBN1 and CRBN PRO: Popular Questions

QUESTION: What's the difference between the Mizuno CRBN1 and the CRBN PRO?
ANSWER: The CRBN1 is a one-piece composite bat with a stiffer feel and more feedback at contact. The CRBN PRO is a two-piece composite with a separate carbon handle, a softer feel and a higher price.

QUESTION: What drop weights do the 2027 CRBN1 and CRBN PRO come in?
ANSWER: Both come in -11, -10 and -9. The -11 runs 28 to 31 inches, the -10 runs 30 to 34 inches and the -9 runs 32 to 34 inches.

QUESTION: What's the difference between the -9, -10 and -11?
ANSWER: Only the weight. At the same length, the -10 is one ounce heavier than the -11, and the -9 is one ounce heavier than the -10. The construction is identical.

QUESTION: Is there a -8 version for 2027?
ANSWER: We haven't seen one. The previous generation of each bat was offered in a -8, but the 2027 lineup is -11, -10 and -9.

QUESTION: Does a -9 drop mean the bat is end loaded?
ANSWER: No. Drop weight is simply length in inches minus weight in ounces. Balanced and end loaded describe where that weight sits in the bat.

QUESTION: What does X-Zone Technology do?
ANSWER: It's the CRBN1's sweet spot tech. Mizuno varies the angle of the carbon fibers in 10 zones along the barrel, which extends the sweet spot toward the taper and the end cap.

QUESTION: Do the 2027 CRBN1 and CRBN PRO come with a warranty?
ANSWER: Yes. Both are covered by Mizuno's one-year manufacturer's warranty.

Ready to swing one of the most trusted names in fastpitch? Shop the 2027 Mizuno CRBN1 and CRBN PRO at LongballBats.com, or call 336-618-7487 and let the Bat Performance Experts help you pick!