The Head TIP Green is the perfect pressurless ball for kids between 9 and 10 years and starter 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.