... gasket, washer, valve seat ring 1).Material: Stainless Steel, Duplex, Cobalt base alloy, Nickel base alloys, etc Metal Ring GasketMaterial: Stainless ... Steel, Duplex stainless steel, super duplex stainess steel Cobalt base alloys Alloy 6Stellite 6Alloy 21Stellite 21Alloy 2Stellite 2Alloy 1Stellite ...