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Marucci CAT9 -10 Junior Big Barrel Baseball Bat: MJBBC9 Quantity
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  • Free Shipping

  • 2 3/4 Inch Barrel Diameter

  • Drop 10 Length-To-Weight Ratio

  • Balanced Swing Feel

  • One-Piece, All-Alloy Baseball Bat

  • USSSA 1.15 BPF Certified (New NTS Tested Stamp)

  • Recommended For Use In Coach Pitch And Machine Pitch Leagues Where Pitch Velocities Are Between 40-45 MPH Or Lower (Typically For 5-7 Year Olds)

  • Colorway: Black | Grey | Silver & Red Graphics

  • AZR Alloy - Undergoes A 3-Stage Thermal Treatment Process. Creates A More Responsive Microstructure That Results In A Better Feel, More Forgiveness & More Performance. It Does All This While Maintaining The Strength Of The Material.

  • Multi-Variable Wall Design Creates An Expanded Sweet Spot And Thinner Barrel Walls That Are More Forgiving After Off-Centered Contact

  • Ring-Free Barrel Construction Allows For More Barrel Flex And Increases Performance With No Dead Spots

  • Precision-Balanced Barrel Results In A Lower M.O.I. And Balanced Feel For Precision And Control

  • 2nd Generation AV2 Anti-Vibration Knob Features An Upgraded, Harmonic Dampening System For Better Feel And Less Negative Vibrational Feedback

  • Micro-Perforated Soft-Touch Grip With Extra Tack Improves Feel And Control

  • Full Twelve (12) Month Manufacturer's Warranty

Marucci CAT 9 -10 Junior Big Barrel Baseball Bat: MJBBC9

This CAT 9 bat is built for young ball players in USSSA leagues that are specifically being thrown to by a coach or a machine. If the speed of the pitch from the coach or machine is between 40-45 mph or below...consider this bat!

Bat Benefits

Marucci outfits even their bats built for the youngest players with their best material. The AZR alloy material undergoes a special treatment process and as a result, it provides (1) better feel (2) more forgiveness and (3) the best performance.

Combine that material with a classic, one-piece design plus the AV2 Anti-Vibration knob and you've got a bat that swings as comfortably as any bat and performs as well (or better) than any bat!


With such a high performing bat, Marucci knows that they have to offer some insurance on it. Because of that knowledge, they do extend a twelve (12) month warranty on this bat. If you buy this bat and notice something wrong within 12 months from the purchase date, please reach out to our resident Bat Experts from JustBats. The Bat Experts will get you the info and materials needed to send the bat to Marucci for a replacement bat!

Average Ratings Based on 2 Customer Reviews

Overall Rating
General Feel
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Overall Rating
General Feel
Bat Adam Coach

Pros: The bat came as promised and ahead of time.

Cons: none

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Overall Rating
General Feel
Best Jr Big barrel Mr. Dad Parent

Pros: Great pop, son loves the feel, only bat he says doesn’t hurt his hand, very durable. Also the only bat my son wants to pick up.

Cons: Bigger kids with a stronger swing would benefit going with the composite or the connect.

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Have a question about the Marucci CAT9 -10 Junior Big Barrel Baseball Bat: MJBBC9? Ask our team of experts and they will respond within 24 hours.

Can you use the USSSA bats in Little League?
Francis Tom Sun
No, one cannot use a USSSA bat, like the Marucci CAT 9 -10 Junior Big Barrel Baseball Bat: MJBBC9, in Little League. For Little League, one must use a bat that features the USA Baseball stamp. These are lower performing bats, like the Marucci CAT -10 USA Baseball Bat: MSBC10USA.
Is there any benefit to using the Junior Big Barrel vs the regular Senior Big Barrel in the same size/weight? My son is 8-9u and I just don't want to have to buy another new bat after the season....
Junior Big Barrel bats are only designed for coach and machine pitch. They will not withstand higher velocity pitches seen in kids pitch.
For machine pitch, which bat will supply more pop for a contact hitter? The CAT9 -10 Junior Big Barrel or the CAT9-10 Senior? Player is on the smaller side.
The Marucci CAT9 -10 Junior Big Barrel Baseball Bat: MJBBC9 is designed for coach pitch leagues, or machine pitch, where the velocity is no greater than 40 MPH. If the player is seeing velocity at or above 40 MPH, or if the player is stronger than their peers, then it would be best to use the Marucci CAT9 -10 USSSA Baseball Bat: MSBC910.
My son will be in his first year of full kids pitch, should I go with the junior big barrel or the next one up? My son swings a 26/16 but we’re moving up to 27/17 and he is 7 turning 8 in move
Tyler Smith
The Marucci CAT9 -10 Junior Big Barrel Baseball Bat: MJBBC9 will not be able to withstand the force of the ball in kid pitch, as the barrel construction is meant for 40mph and below.
Show all 4 Questions and Answers about the Marucci CAT9 -10 Junior Big Barrel Baseball Bat: MJBBC9
No results. If you searched for a specific term, please broaden your search. If you have already done this and still cannot find what you're looking for, please submit your question and we'll get back to you within 24 hours. Thanks!

At Marucci, they make their products the same way you play baseball: Hard work, determination, and attention to detail. This product is handcrafted. We are committed to never releasing a product before it meets the standard set forth by our wood bat. Our process is proven. The only way to achieve perfection is to accept nothing else. We first have gloves to Big Leaguers in our inner circle to break in and critique - knowing the extreme situations they would be put in. Players like Chase Utley allowed us to comprehend what a player needs and looks for in an ideal fielding glove. The Marucci player advisory board was integral in testing, tweaking, and ulitmatley perfecting the glove line to have the feel and features that matter to players. Understanding this professional standard of perfection has allowed us to handcraft a performance product that will last consistently maximize your game. Handcrafted, one by one, with the highest quality materials, for superior quality and feel, these gloves will require a gradual break-in period which provides a longer lasting form and shape. Professionally Inspired. Precision Crafted. Marucci: Honor the Game.

Marucci CAT9 -10 Junior Big Barrel Baseball Bat: MJBBC9
Approved For USSSA
Barrel Diameter 2 3/4
Baseball Bats Coach Pitch
Bat Construction One-Piece
Bat Type Baseball
Color Black Grey Red
Deals Personalization Eligible
Length to Weight Ratio -10
Material Aluminum
Series CAT CAT9
Swing Weight Balanced
Vendor Marucci
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Marucci CAT9 -10 Junior Big Barrel Baseball Bat: MJBBC9

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