Product Name: ASME B16.20 SW Gasket
Type: Spiral Wound Gasket
Design Standard: ASME B16.20
Size: 22 Inch, DN550
Pressure Rating: Class 150 LB, PN20
Inner Ring Material: SS 316
Outer Ring Material: Carbon Steel
Filler Material: PTFE

Source: https://www.landeepipefitting.com/asme-b16-20-sw-gasket-22-inches-class-150-lb-ptfe-filler.html