Product Name: Basic Type Kammprofile Gasket
Construction: Metal Core Plate with Serrated Surface, Both Sides Bonded with Flexible Graphite
Materials: Metal Core, Flexible Graphite
Application: Suitable for Tongue-and-Groove Flange Sealing
Source: https://www.magpievalves.com/basic-type-kammprofile-gasket-metal-core-flexible-graphite.html