This is an aftermarket package of 2 brand new muffler/exhaust gaskets that will fit the Webra 6.5 CCM, 2 stroke motor as well as many other similar size motors. They are slightly thicker and larger than a normal muffler gasket for much longer life and to avoid tearing. Some new engines don't even come with them. Made of high temperature 1/32" automotive grade material to last a long time and avoid any leaking. We also recommend a drop of threadlock on the screw threads as well.