The Metalab Double Jointed 20 MM Oval Link Pelham with Curb Chain features a sliding cheeks, as well as a 20 mm, solid mouthpiece with an oval link and a 1-3/4" 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.