Product Name: Spiral Wound Gasket with Inner Ring
Construction: Solid Metal Inner Ring with Uniform Winding of Metal Strip and Flexible Graphite, Without Centering Outer Ring
Materials: Metal Inner Ring, Metal Strip, Flexible Graphite
Compression Deformation: ≥ 3.42 mm
Application: Suitable for Male & Female Flange Sealing
Source: https://www.magpievalves.com/spiral-wound-gasket-with-metal-inner-ring-steel-strip-fg.html