The 55cm BodyTrends anti-burst fitness ball. Incorporate the versatility and effectiveness of the BodyTrends' Anti-Burst Fitness Ball into your workout. Whether you are new to fitness or a seasoned athlete, this ball will enhance your workout giving you results. Ideal for stretching, strengthening, and toning exercises. First used by physical therapists over 30 years ago, Fitness Balls are now used in leading health clubs around the nation and are quickly becoming a standard item for any home gym. The BodyTrends' Anti-Burst Fitness Ball is safe, durable, and easy-to-use. Use our ball sizing chart to select the right ball size for you. The ball is made of burst resistant heavy gauge PVC vinyl and is rated to withstand up to 600lbs pressure. Includes: 2 ball plugs, 1 pump adapter and inflation instructions. Available in 55 cm or 65 cm sizes.