Product Name: Stainless Steel Spiral Wound Gasket
Design Standard: ASME B16.20
Size: 16 Inch, DN400
Pressure Rating: Class 150 LB, PN20
Thickness: 4.5 mm
Material:
Inner & Outer Rings: Stainless Steel SS 304
Filler: Graphite
Source: https://www.landeepipefitting.com/stainless-steel-sw-gaskets-ss-304-ir-or-16-inch-150-lb.html