Product Name: Spiral Wound Gasket with Inner and Outer Rings
Type: Spiral Wound Gasket
Materials:
Inner Ring: SS 304
Outer Ring: SS 304
Metallic Strip: SS 316
Size: 3 Inch
Pressure: Class 150 LB

Source: https://www.landee.cn/stainless-steel-sw-gaskets-ss-304-ir-or-3-inch-cl150-lb.html