Sinister Diesel has now perfected our multi - Layered Steel cylinder head gaskets. Featuring a durable black coating, with five stainless steel layers. Adaptive fluoroelastomer (FKM) coating flows to seal rougher surface finishes These gaskets were designed to keep the cost down, and the performance up. Improved durability, Reduced oil consumption, Improved engine performance , Reduced bore distortion, Includes Left and Right Side