Performance Machine Vision Series Cam Covers give you the power to view what goes on inside the heart of your bike's cam chest. 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 percision CNC machined out of bille aluminum and come comlete with chorime hardware and any required gaskets. These sexy see-through accessories are a great alternative to the prudish stock parts.