... W-shaped stainless steel strip and soft non-metallic packingFiller: flexible graphiteInner/ Outer Ring: Carbon Steel, SS304, SS316 ... flange with male and female face;3. CG type: the type with inner ring is the gasket ... CGI type: the type with the inner and outer ring is the sealing gasket used for the smooth ... Steel belt: 304, 321, 316, 316L, etc.B. Ring material: low carbon steel, 304, 316, 316L, etc. ...