SUESPORT 1000lbs Static Strength Anti-Burst Exercise Ball Kit With Pump, Body Balance Ball, Yoga Ball, Exercise Stability Ball, 3-Size Available Static pressure testing -- No mutations occurs after time 1 hour under 700kgs pressure (approx 1500Lbs). When shopping around for an exercise ball, note that what many of other companies balls are slim & light weight, indicative of inferior quality. Dynamic durability testing - No mutations occurs after 20,000 loading cycles of an elastic load of 130kgs (approx. 260LB), this is a destructive testing. We state 260LB instead of 1500Lbs in the package box, to avoid extreme destructive testing or using by few customers. Anti-burst testing -- The ball is loaded, then, on the maximal lateral extent a pointy object (e.g. a pin or tack) with diameter 1.5mm is driven into the ball with a force of 750N and then removed. Afterwards, the ball is loaded 20times with 750N. Interval:15 cycles per minute. No sudden explosive breakage occur, i.e. air exit the ball slowly. BPA & Phthalate-Free, Eco-friendly PVC material. A top quality anti-burst exercise ball (or called yoga ball, fitness ball, balance ball,gym ball) is perfect for all exercises, athletic training, physical therapy, and Yoga routines. 60-Day Money Back & 1 Year Warranty, if you are not happy within 60 days we will refund or replace the product. Note: for optimal performance, it may be necessary to re-inflate your new Balance Ball once or twice after the initial inflation,to make PVC material gets fully stretched is the key. Available in 3 sizes. Size options: 55 cm ( 5' to 5' 3" tall),65 cm (5'4" to 5'8" tall),75 cm ( 5'9" to taller).The size/height guidelines shown are suggestions only. Some therapists, trainers and midwifes may suggest that you use an alternative size.