Stainless steel material, heat fast, easy to replace,Quality good.. Manufacture typeDimension(Diameter mm)PowerYH-38C-2 Φ 38 X 33 150W YH-50C-2Φ 50 X 33200WYH-80C-2Φ 80 X 33250WYH-100C-2Φ 100 X 33380W Stainless steel material, heat fast, easy to replace,Quality good. heating core,heating ring of solder pot,Stainless steel material, heat fast, easy to replace