BURST RESISTANCE: Made of soft and elastic polyvinyl chloride or PVC, our Exercise Ball can withstand up to 800 lbs without bursting. It’s designed to safely deflate instead of popping like a balloon when it rolls over sharp objects such as staples and pins, is pricked by jewelry or a sharp belt buckle, or is compressed under a heavy load.t makes a perfect balance ball,it slowly deflates and protects you from injury during vigorous exercise or while using it as an office chair.
