RetroArcade.us Replacement Trackball Ball 3 inch Clear TranslucentProduct Information: Trackball Size: 3 Inch DiameterColor: Clear TranslucentFits Trackballs: RA-TRACK-BALL, RA-TRACK-B-3-USB-PS2, and RA-TRACK-B-3-USB-NONUPC: 665570199228SP: Trackball, Ball, Jamma Trackball, MAME Trackball, Arcade Track Ball, 60-in-1 trackball, Jamma 60-in-1 PCB, Jamma 60-in-1