Approved by the ITF and USTA, the Babolat Play and Stay Red Foam Tennis Balls are perfect for beginner players new to tennis. Constructed with red felt, this tennis ball is engineered to be slightly larger and 75% slower than a standard tennis ball. This ball can help improve the players awareness of the ball, space, and stroke. Applies the recommendations of the ITF and its Play and Stay Program. Comes in a zip-lock bag with 24 balls.