Squash balls are unlike any other sports ball. The ball does not bounce until it is warmed up by hitting it hard 50 100 times. After that the ball reaches an equilibrium temperature and is quite bouncy. Unfortunately, you have to continue to hit the ball hard to keep it warm and lively.Since beginners and intermediate players can not hit hard and have long rallies, Dunlop offer four different type of squash balls. The difference among them is that they will bounce the same without having to hit them hard.