... : Cast iron , Alloy , SteelPiston ring Feature : 1 Chrome-plating ,2 Line-honing ,3 nitridation , 4 phosphating , 5 Molybdenum plated(Moly-inlaid ... 80 mm to 160 mm8)Product Characteristics: Germany and Japanese advanced technology , Wear proof , High temperature resistant . 9)For European& American model ...