Jamma Trackball Interface Wiring Harness for 3" Trackball for 138-in-1, 276-in-1, 352-in-1, 412-in-1 Pcbs Quick connection between 138-in-1 (horizontal), 276-in-1 (vertical), or 352-in-1 (horizontal) Classic Arcade Multigame PCBs Works with just one (1 Player) or two trackballs (2 Players) installed in your upright or cocktail cabinet Please note this does not include a Trackball or PCB!