Gaskets are colour coded to help expedite the selection and identity of the gaskets you need.The colour on the outside edge of the centering ring identifies both the winding and filler materials.The metallic winding material is designated by a solid colour. The filler materials are designated bycolour stripes at equal intervals on the outside edge of the centering ring. Flexitallic colour codingmeets the industry standard for metal and filler materials listed in ASME B16.20.