This hard ball is the perfect toy for real avid players. The balls are made of hard plastic material, so they do not collapse. The balls have a rope in them over which the ball can move. These play balls can be filled with sand to make them heavier. 

The balls are available in 2 colors red and blue, and 2 sizes, ball diameter 17cm, rope length 60cm and ball diameter 25cm, rope length 80cm.