All are fabricated using highly specialized blow-molding techniques similar to those used to form aircraft canopies; the result is virtually distortion-free optics. Made from the finest grade of 1/8" acrylic plastic. Each windscreen is stretched as it is The Zero Gravity® SR Series™ is made of high-quality acrylic plastic, formed to emulate the original factory screen. SR series screens feature the best value with optical quality, fit and finish of any other windscreen in the world. Manufactured in the U.S.A., Zero Gravity® SR Series™ screens are factory pre-drilled and designed to fit your O.E.M. fairing with precision using your stock mounting fasteners or Zero Gravity® wellnut and fastener kits. Best optics of any windscreen on the market.