This new generation of popular therapy and fitness balls are perfect for conditioning postural reflexes and motor control. They use advanced technology and an homogeneous material that resists collapsing - even after a puncture. There is, therefore, no danger of big splits, tears or sudden loss of pressure. Latex free. Available in three diameters: Red - 55cm Blue - 65cm (currently out of stock) Yellow - 75cm Maximum user weight 300kg (47 stone).