The fitness mad 300kg anti burst swiss ball 65cm is ideal for fit ball workouts yoga pilates or physiotherapy and can be used as a chair to aid with postural problems lightweight and easy to use the ball will help you improve balance flexibility and muscle tone as well as strengthen the core muscles this durable and tough ball is rated as suitable for up to 300kg 6614lbs load and is sbs labs tested as burst resistant at over 500kg 11023lbs static load it is 65cm 256 in diamete