ScienceofSpeed Billet Camshaft Plugs replace the factory plastic camshaft plugs with a hard anodized billet aluminum plug with double o-ring seals. CNC machined 6061 aluminum, anodized, then CNC engraved with ScienceofSpeed logo. Our unique double o-ring seals are specially made out of high temperature resistant Viton for long term durability. Will last longer than factory plugs, especially in forced induction and racing applications & looks great too.