The leak stops here! Cometic MLX head gaskets feature a unique integrated "stopper" layer for optimum combustion chamber sealing and improved clamp load around the cylinder without increasing bore distortion. The MXL head gaskets, like their MLS ones, are multi-layer stainless steel for increased strength and require no sealants or re-torquing. Cometic is responsible for innovative MLX head gaskets that help maximize your engine's power and performance.