This versatile inflatable ball is great for games, relaxation and all kinds of fun. Its knobbed surface provides fun physical stimulation and can also help to calm agitated children or those with sensory disorders.  Varying its level of inflation allows it to be used in several different ways, such as for bouncing & rolling, balancing, or as a calming rest place. The ball measures 75 cm (about 30") in diameter and can hold up to 100 kg (about 220 lbs) depending on how much you inflate it.