Gamma Quick Kids 78 Tennis Training Balls are for kids who are just beginning to play tennis on a full 78-foot court. Medium compression and lower bounce offer more time to react and set up each shot. These kids' tennis balls foster the consistency and control that helps beginners improve their strokes. Two-tone felt helps with teaching and learning spin control. These slow-bounce tennis balls conform to the ITF Stage 1 standards. Available as a set of 12 tennis balls, they are perfect for full-fledged practice sessions.