After I had noticed in the stability ball a colleague that this too smelly after a few months, I have decided for the more expensive Pezzi Ball. This was the beginning of a slight odor, which I have not experienced as unpleasant. Moreover, that smell is gone after a few weeks. When cheap model my colleague I noticed also that this aufwieß a slight streaking in rubber after some time. I have the ball now about a month and could not detect any changes in the gums with my model so far. In practice, my physiotherapist there Pezzi balls, which are now over 10 years old. Even in these instances can not detect changes in the rubber. My ball seems to keep the air well, so I did not have to re-inflation so far. In my opinion, it is worthwhile to spend a little more money for the original. I am completely satisfied.
