2021 Marucci CAT 9 Composite USSSA Bat Review
Marucci's first composite USSSA travel bat, built around a new MDX composite barrel with ridiculous pop and a two-piece connection that feels like butter. A durable answer to the broken DeMarini CF Zen.
The Score
How we score ↗How big and forgiving the barrel is — based on barrel length, construction (one- vs two-piece, alloy vs composite), and how it plays on balls hit off the center. A primary driver of the overall score.
Raw exit velocity and distance. We use measured numbers from freely available independent testing when they exist; otherwise construction and consensus, judged against the certification’s performance ceiling. A primary driver of the overall score.
Comfort and feedback on contact — vibration dampening from the knob/connection, the sting of a stiff one-piece vs a smooth two-piece, and the sound off the barrel. A primary driver of the overall score.
How well it holds up and how the company stands behind it — documented cracking/denting reports, cold-weather behavior, and the brand’s real warranty record. Good to know, but weighted lightly in the score.
Our take on price-for-performance — the overall package weighed against its cost and what comparable bats run. Shown for context; it is NOT factored into the overall score (price changes too often and is personal).
Our Review
Marucci finally entered the composite game and nailed it. The new MDX barrel had us breaking exit speed records on the Pocket Radar, and the two-piece connection makes every swing feel like butter with zero vibration. After thousands of hits at our facility it has shown no cracks, making it the durable replacement so many fed-up CF Zen users have been waiting for.
Insider Note
Mike has visited Marucci in Baton Rouge and sat down with CEO Kurt Ainsworth; says it took Marucci several years to release the Cat 9 Composite to ensure quality and durability.
Pros & Cons
Pros
- Ridiculous pop, breaking exit speed records on the radar
- Two-piece outer locking system kills sting even on bad hits
- Solid feel with zero vibration and no power-losing flex
- Ring-free barrel avoids dead spots; backed by a 1-year warranty
- Strong early durability with no chips or hairline cracks after heavy use
Cons
- Quieter sound than the metal Cat 9 and Cat 9 Connect
- Durability only proven early in the bat's life cycle
Full Specifications
| Brand | Marucci |
|---|---|
| Model | CAT 9 Composite |
| Model Year | 2021 |
| Certification | USSSA |
| Sport | Baseball |
| Construction | Two-piece composite |
| Model # | MSBCCP910 |
| Drop | -10 |
| Barrel | 2 3/4" |
| Swing Weight | Balanced |
| MSRP | — |
Where to Buy
2021 Marucci CAT 9 Composite USSSA Bat — FAQ
Is the 2021 Marucci CAT 9 Composite a good USSSA bat?
We rate it 8.0/10 (Grade A). Marucci's first composite USSSA travel bat, built around a new MDX composite barrel with ridiculous pop and a two-piece connection that feels like butter. A durable answer to the broken DeMarini CF Zen.
What drops does the CAT 9 Composite come in?
The 2021 CAT 9 Composite USSSA comes in -10.
Is the Marucci CAT 9 Composite USSSA-legal?
Yes — it's USSSA certified by the NTS lab. USSSA 1.15 BPF approved — the “hotter” travel-ball standard, legal for USSSA play.
New to buying bats? Read our bat sizing guide, certifications explained, or browse all guides.
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