Skunk2 Pro Series Cam Gears features a superlight design and are CNC Machined from high quality billet aluminium. Each Gear has Laser eteched timing marks with +/- timing adjustments. Skunk2 Cam Gears feature skunk2 proven 6 bolt design. Outer gear is hard anodized for durablity and center hub is titanium anodized for the racing look. Pro series cam gears are five percent lighter than tuner series cam gears.