Review on Transform Your Fitness Routine With Gruper'S Anti-Burst Yoga Ball And Chair Set: Includes Hand Pump And Workout Guide Access! by Jerry Delozier

I use the ball as a chair. I usually prefer one with a small weight inside to prevent it from running off when I stand up, but my new office space is small enough that is doesn't matter. The studs on the surface are okay, although they do leave marks after a while.However, I have to pump it back up at least once a week because the ball gets soft. from slowly deflating. I ca't find a leak, so it's probably a bad seal at the plug.The second ball we bought at the same time also slowly leaked until it was accidentally punctured from rubbing against a brick fireplace. The extra thickness did not prevent a puncture.