High intensity polycarbonate construction is capable of surviving intense close range BB shots Designed to provide maximum protection to the lens of high quality optics during airsoft games Compatible with all 20mm weaver and Picatinny accessory rails Compact in size to minimize rail space needed Well designed lens provides flawless optical clarity Compatible with most risers and adapters In the Box 1X Optic BB Shield Specifications: Brand Speed Airsoft Build Metal / Polycarbonate Compatibility 20mm Picatinny Rails Color BLACK/CLEAR California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov