Performance Machine Vision Series Derby Covers give you the power to view what goes on inside the heart of your bike's clutch pack.  The UV and abrasion resistant polycarbonate lens is framed by a 6061-T6 aluminum bezel to add structural integrity as well as provide an even distribution of clamping force to eliminate cracking. All Vision Series Covers are precision CNC machined out of billet aluminum and come complete with chrome hardware. These sexy see-through accessories are a great alternative to the prudish stock parts and are offered in Contrast Cut, Chrome and Black Ops finishes.