Fitness-Mad's Studio Pro Swiss Ball is rated at a massive 500kg and is one of the toughest balls available. Fitness-Mad's gym balls have been extensively tested by SGS Laboratories for burst-resistance and static loading. Perfect for clubs, gyms, studios as well as weight training, Fit Ball workouts, yoga, Pilates, or physiotherapy. Features: 500kg burst-resistant ball for serious workouts Studio quality swiss ball Recommended user height over 5'10" Material: 6 phthalate and heavy metal free PVC Colour: Grey Dimensions: 75cm (DIA) Weight: 2.1kg Warning: Never leave the Swiss Ball near a heat source. Care Instructions: Your ball can be wiped clean using a damp cloth and mild detergent. Avoid using harsh chemicals.Safety Information: Rated as suitable for 300kg load. SGS Labs tested as burst-resistant at over 500kg static load. SGS Labs tested with a static load of over 1.5 tons without failure.