Main Material: Body: FC200/HT200 (Cast Iron) Bonnet: FC200/HT200 (Cast Iron) Disc: Bronze (BC6) or SCS2 (2Cr13) Seat: Bronze (BC6) or SCS2 (2Cr13) Stem: Brass (C3771BD) or SUS403 Gasket: non-asbestos Packing Gland: Bronze (BC6)/Brass/Carbon Steel Handwheel: FC200/HT200 (Cast Iron)