The pressureless HEAD T.I.P. GREEN is the perfect ball for kids between 9 and 10 years old and for adults about to transition to a full-size court. It is slightly softer, bigger, and only 25% slower than a standard tennis ball and helps the kids to keep their game and strokes under full control. Developed with trainers and kids, the HEAD T.I.P. GREEN is perfect for kids and first-timers to learn how to play on the full-size court. The ball is part of HEAD's Tennis Instruction Program (T.I.P.), a unique approach to help youngsters learn the game right, developed in cooperation with the International Tennis Federations' "Tennis Play and Stay!" campaign.