I bought this product for myself to use in my classroom. I intended to use it myself for improving my own balance and posture being on my feet all day and also as a therapeutic tool for some of my pupils. When I received it it looked extremely flimsy and not good quality at all however I gave the product the benefit of the doubt and tried it out. I found that it lost air quickly and I had to pump it up at least once a week in order for it to be effective and do the job it is meant to do and advertised to do. Realising how unsafe this product is I quickly put an end to my pupils using it, much to their disappointment, and it's just as we'll I did as the ball burst when I sat on it, and I am by no means a big person! I would buy this product ever again and had I known how awful it was I would never have bought it in the first place. If you are looking for a good quality Swiss ball, this is definitely not the one for you. I wouldn't recommend this to my worst enemy.