1 All stainless steel material 2 Zero leak 3 Low torque 4 High quality, ... .6MpaMaterials of Body: CF8,CF8M,CF3MMaterials of Disc: Stainless steel, Plated Ductile cast iron, Ductile iron coated PlasticMaterials of Seat: EPDM,NBR,PTFE Materials of Stem: Stainless steel, Carbon steel