Spiral wound gasket inner and outer ring is made of Stainless Steel Metal Strip Tape for Inner and Outer Ring of Spiral wound gasket, we have many materials such as 304(L), 316(L), 321, 317L, 31803, Mon 400 to make Spiral Inner and outer ring. You can have those material from us Kaxite to bend the gasket ring. Flat Stainless Steel Metal Strip Tape for Inner and Outer Ring of Spiral wound gasket is normally to bend inner and outer rings of Spiral wound gaskets. Grooved metallic strip is making for Kammprofile gaskets.