Clutch Masters Twin Disc 8.5in Street 2015 VW GTI 2.0L(Flywheel Sold Separately) Hydro Slave Inc.The cover assembly is machined from billet aluminum and is then Type 3 hard anodized. Our billet covers have roughly 25% more tensile strength than the competitions cast unit. By focusing our ability on machining the trongest cover possible while maintaining minimal weight, we are basically able to eliminate any flex in the cover. Our billet covers see only . 003 of flex where as a cast or stamped unit can see as much as . 030 of flex. By eliminating