Jewelry or restraint? It\'s up to you! The oval shaped bracelets are made of stainless steel and are available in two sizes: 60 mm x 46 mm inner diameter with a width of 20 mm or 66 mm x 52 mm with a width of 17 mm. Both versions are about 7 mm thick. All edges are perfectly smooth. Each cuff is locked by an allen screw, a matching allen key is included.