Spring gasket:SS304 Handle SS304/201 Cap:SS304 Gasket:PTFE Stem:SS304 Fight cap:SS304 Gasket:SS304 Seal ring:PTFE Body:SS304 Main material: 304 and 316. Design and manufacture adoption: ISO, API, GB, BS, we are strict with the security and quality ,it was accepted by clients and sells to internal, external market.