Cometic Multi-Layer Steel MLS Gaskets are designed to create the best possible seal for naturally aspirated, boosted, or nitrous-fed engines. The head gaskets are made from three to five layers of spring stainless steel, offering a stronger base material than standard head gaskets. The outer layers are Viton coated stainless steel providing a superior seal not available with other steel or copper gaskets. The gaskets offer excellent rebound characteristics and are made to resist corrosives. MLS head gaskets reduce bore distortion but still can withstand extreme cylinder pressures. Sold individually.