Product Name: Type F Flange Insulation Kit
Type: Flange Insulation Kit, Type F
Components: Gasket, Sleeves, Washers
Material: Phenolic
Size: 12 Inch
Pressure Rating: Class 300 LB

Source: https://www.landee.cn/type-f-flange-insulation-kit-phenolic-12-inches-cl300-lb.html