James RCM (Rubber Coated Metal). OEM replacement reference 34906-79; 34906-79A. James” RCM gaskets consists of a .020″ thick stainless spring steel base covered with a .001″ thick heat resistant Viton rubber on both sides. A very strong gasket which requires no re-torquing. Gaskets will not weep; extrude; tear; become brittle over time or burn out.