It depends on customer's requirements,we are able to use 2738, 718,P20 ,S50c and other's steel build tools for chair and desk. YOUNGER Mold Technology is expert in Plastic Mold Design ,Plastic Mold Making and Plastic Injection Molding process.We have experienced many kinds of moulds such as bumper mould,auto light mould ,grille mould,washing machine mould,air-conditioner mould, and moulds for cleaning machine automatic Scrubber grass mower field mowerother plastic parts.