Made of copper surface, copper material is very soft, can play a good sealing effect.Heat resistant and durability.Lower the noise and make you motorcycle more stable and comfortable.Installation: remove the exhaust pipe; clean the cylinder head connector; put the exhaust pipe gasket into the cylinder head.If the gasket is too loose, you can apply a little bit of butter or sealant on the gasket to stick it, and then install the exhaust pipe.Package includes: 20 x exhaust pipe gasket