TheChainGang Shock Absorber Ribbed Ball Stretcher Weights, 316L Surgical Steel Ball Stretchers Start stretching today with the Shock Absorber Ball Stretcher. It is made of 316LVM Surgical Steel. It is quality and easy to clean too. The two piece design makes it easy to put it on or take it off, and you can use it alone or stack weights as you stretch. Numerous sizes are available so that you will be able to get the perfect fit. If You Order the wrong size? No problem, we will exchange them if they do not fit.