ball (rhythmic gymnastics)

The Ball is a piece of apparatus used in rhythmic gymnastics. It is made of either rubber or synthetic material (pliable plastic) provided it possesses the same elasticity as rubber. It is from 18 to 20 cm in diameter and must have a minimum weight of 400g. The ball can be of any colour. The ball should rest in the gymnast's hand and not rest against the wrist or be able to be grasped.