The Boneyard Ball Strap. This 1.5 in. medical grade silicone snap ball stretcher comes with 3 snaps on one end and 1 on the other giving the wearer 3 options to find the correct size. Traditionally snap rings are made of uncomfortable hard-stitched leather or rubber and until now have never been attempted to be crafted from soft touch silicone. Safe with all lubricants, completely hypoallergenic, non-irritating and compatible with sensitive skin. One size fits most.