The Metalab 13mm Jointed 13 MM Rubber Pelham with Curb Chain features a stainless steel, single jointed, 13 mm rubber mouthpiece and a long lever. 2-3/4" Bottom CP. 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.