Specially designed for use with a pitching machine, this Champion Sports 9 Inch Safety PU Sponge Baseball comes in a brilliant optic yellow that stays clearly visible during both indoor and outdoor batting drills. The ball is made from a durable polyurethane sponge material that is safe for younger players entering the batting cage for the first time and won't damage walls when used indoors. Comparable to JUGS and LITE-FLITE in design, the safety baseball is compatible with all JUGS pitching machines.