This bright red Thera-Band Anti Burst Exercise Ball is 550mm (21.5\") in diameter and is from a range of top quality exercise balls available from Thera-Band, one of the largest and most highly regarded suppliers of therapy aids to the healthcare sector.This anti-burst version of their exercise ball uses Thera-Bands patented \'Crylon\' design, that comes with a guarantee from Thera-Band that even during bounce exercises a puncture will not cause the ball to burst or collapse. The inflatable vinyl exercise ball is ideal for helping a user to improve the strength and tone of the muscles in the legs, arms, abdomen and torso, and will also help to improve a users balance, flexibility and coordination. The Thera-Band Anti Burst Exercise Ball is perfect for use in a wide range of therapy situations, and ideal for sporting environments and many other applications such as gymnastics training. This colourful, bright red Exercise Ball is made from hard wearing PVC, has excellent dynamic performance and is recommended for use with extreme loads such as aerobic exercises and for use as a sitting ball. The Thera-Band Anti Burst Exercise Ball is available in a range of different diameter sizes all of which can be found in this area of our shop. Please note that the Exercise Ball is supplied flat and deflated and will require inflation prior to use.