JEGS premium steel core gaskets are ideal for engines with high crankcase pressure due to a power adder(s), suction from a vacuum pump or anyone just looking for a better gasket. Features an outer shell of neoprene rubber that is vulcanized over a steel inner core resulting in a 3/16" gasket, for strength and longevity, in addition to being re-useable. Resists the pushing out or drawing in common to other types of gaskets. Sold in pairs.