JM21 Custom Pro

$169.99
(No reviews yet) Write a Review
Note: Cured for 3 days, ProX is our hardest finish and therefore more resistant to dents and carries an increased 45-day warranty.

JM21 Custom Pro

Similar cut to the TH17, the JM21 also offers a small barrel with a traditional knob, but a slightly larger handle than the TH17.

  • Knob: Traditional
  • Handle: Thin
  • Barrel: Small
  • Feel: Balanced
  • Handcrafted from top-quality maple or ash
  • Bone rubbed for ultimate wood density
  • Big League-grade ink dot certified (maple only)
  • Marucci will not engrave any Big League player names, trademarked words, phrases, or logos, NCAA licensed marks other than those currently offered, or anything else deemed inappropriate
  • 30-day warranty included
JM21 Custom Pro

Are You Sure?

What is a Smart-Ready Knob?

Marucci’s Smart Bat technology allows Diamond Kinetics’ SwingTracker sensor to be securely fitted inside of the actual knob of a Custom Pro Model bat. By selecting Smart-Ready knob, you’re authorizing Marucci’s wood production team to carve out part of the knob and install a dual-locking mechanism to firmly hold your SwingTracker sensor in place, allowing for the most accurate data possible.

Don’t forget the sensor!

The Diamond Kinetics SwingTracker sensor captures your most precise swing data using 11 different metrics in four core swing categories: speed, power, quickness, and control, then sends it to the SwingTracker app through a paired iOS device via Bluetooth. View metrics in easy-to-read graphics and charts or sync with a unique 3D image or video of your swing.

Get a Sensor