bumper molds mould molding1.Material:P20,2738,718,45# 2.Cavity Qty: ... We are specialized in designing and making bumper molds mould moldingProduct Name bumper molds mould moldingCore & Cavity Steel S50C(45#),40Cr,P20H ... ,718H,2738,5CrNiMo,38CrMoAC,H13,S136HSteel hardness HRC 28--50Molding Way Compresion molding,Injection ...