What makes our Vision Series better? We engineered a 6061-T6 billet aluminum bezel to attach the polycarbonate window for structural integrity and to provide even distribution of clamping force to prevent window cracking. The thick Poly window is also UV and abrasion resistant to maintain clarity for years. Performance Machine offers a complete series of Vision Series Covers and Air Cleaner for H-D engines that offer the unique ability to view the inside of your engine. Each cover is CNC machined out of billet aluminum and comes complete with chrome hardware and any required gaskets. Offered in Contrast Cut, Black Ops and Chrome finishes. DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE.