The different colour balls are subject to age. This new modified game-base style of coaching has been proved to be the best way for children to learn and develop the right skills to compete and improve their game in all areas. There are 3 kinds of low-compression balls which are softer and bounce lower than a normal yellow ball. The lower bounce allows the player to have more time, which allows better control and helps kids develop correct technique. The important thing is that children should not progress too soon.