The Metalab Double Jointed Loose Ring 12 MM Bradoon with Oval Link Bit features a solid stainless steel mouth, along with 2 1/8" rings. Metalab steel is manufactured on a base of 18 chrome high quality stainless steel and this by using the "Lost Wax" procedure. This procedure assures a perfect workmanship compared to the sand mold procedures where small mistakes can occur.