I was so excited to get my chairs free waiting 10 days for it to arrive. However, when I opened the box, I noticed the pump was missing the nozzle piece to stick in the ball to blow it up. My boyfriend tried his best to blow it up without it. The ball is way too small for the chair. It might be possible that it can expand more but since our pump is missing the essential tip, I will never know. I am very dissatisfied and will be returning this product.