Product Name: Spiral Wound Gasket with Inner and Outer Rings
Construction: Solid Metal Inner Ring with Uniform Winding of Metal Strip and Flexible Graphite, Assembled with a Centering Metal Outer Ring
Materials: Metal Inner Ring, Metal Strip, Flexible Graphite, Metal Outer Ring
Compression Deformation: ≥ 3.42 mm
Application: Suitable for Flat Face and Raised Face Flange Sealing
Source: https://www.magpievalves.com/spiral-wound-gasket-with-inner-outer-rings-fg-metal-strip.html