The pressureless HEAD Stage 1 GREEN ball is an ideal choice for children between 9 and 10 years and beginner adults who are transitioning to a full-size court. It is slightly softer, and 25% slower than a standard tennis ball, making it easier for kids to maintain control over their game and strokes. Designed in collaboration with coaches and young players, the HEAD Stage 1 GREEN is perfect for beginners learning to play on a full-size court. It is part of the Stage Program, a unique initiative created to help young players develop their skills, in partnership with the International Tennis Federations Tennis Play and Stay! campaign.