PU Urethane Roller Skate Toe Stoppers with 5/16" (8mm) Bolts, 83A Roller Quad abrasion resistant colors urethane toe stopper
https://www.vogueparade.com/shopping/EN/200003541/1/1005002759983522/pu-urethane-roller-skate-toe-stoppers-with-516-8mm-bolts-83a-roller-quad-abrasion-resistant-colors-urethane-toe-stopper//