PTFE+bronze(brown,green); PTFE+glass(white,blue); PTFE+carbon(black); virgin PTFE(white),etc. Other special material is also available. Spring style U shaped spring(Type 400) Round wire spring (Type APS) O shaped spring (Type 103) Groove style Standard Heel Groove. Extended Heel Groove. Flanged Heel Groove. Radial Seals in Static Service. Radial Seals in Reciprocating Motion. Inside face Seals in Static and rotary Service. Outside face Seals in Static and rotary Service Application Aircraft, aerospace Medical instrumentation Liquid chromatography Semicoductor manufacturing equipment Petroleum and chemical process equipment Pumps, valves.compressors and mechanical seals