Hello There, I bought for exercises and spinal Gentler seats with the Pezzi ball. I can only recommend the ball. the negatives of the ball is unique, He must clear my earnest. Although he does not stink so disgusting sickening as the plastic stuff from China and Co come but it must evaporate. As this took a little (After 2 days the whole room no longer reeked the plastic odor) he gets only 4 stars otherwise I multiple plugs for closing and also an attachment for an air pump was there. It is very robust and you can inflate him well plump For 2 weeks it is inflated and in use and I have not noticed that the ball loses air. Recommendation: Buy =)
