Stock up on the tennis balls, perfect for elementary-aged players with the Prince(R) Youth Stage 2 12-Pack Tennis Balls. Stage 2 Tennis Balls 12-pack, UTSA Stage 2 transition tennis balls Best suited for ages 8-10 Rebound: 41-47 inches Reduced ball speed of 50% compared to a standard tennis ball Aids in swing technique development of young players Balls include mesh storage bag