MARV Leather/Foam Lightweight Pitching Machine Balls Realistic baseball flight. Less sting on contact. The MARV Leather/Foam Pitching Machine Ball combines a leather cover with a lightweight foam core to closely replicate real baseball flight while providing a more forgiving feel on contact. At 3.75 oz, it delivers realistic training while being easier on hitters’ hands and bats. Approved Trajekt ball: Designed and tested for use with Trajekt pitching machines and used at the highest levels of the game. Broad machine compatibility: Works with all pitching machines that can throw a baseball, including Trajekt, iPitch, and eHack models. Leather exterior: A traditional baseball cover with visible stitched seams. Lightweight foam core: Reduces sting during repeated hitting sessions. Durable stitching: Japanese Kevlar seams built for repeated training use. Full-distance performance: Consistent flight during high-speed machine training at full distances. Weight: 3.75 oz per ball. Sold by the dozen — 12 balls per order.