Constructed of durable ABS polymer. Compatible with most 30mm scopes. Eliminates sun glare from scope during combat. Hold your position in discretion when outdoors. Very simple and durable kill flash design. Durable mounting retention band for scope. Great for MilSim combat and training experience. In the Box 1X Kill Flash Specifications: California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov