Poli-Pro Discs are made of strong, thin polyester film coated with micro-grained abrasives.  The disc is bonded to a rubber mount that slips easily onto a specially designed stainless steel shank.  The rubber mount covers the shank to protect tooth structure and provide easy mounting and removal, yet holds firmly during use.  Because Poli-Pro Discs have no metal centers or protruding shanks that can gouge or discolor composite, they provide fast, worry-free finishing and polishing of all composite restorations.