High impact polymer construction For use with 40mm rifle scope Eliminates reflection of light from lense Honeycomb cells reduce glare similat to a 7 sunshade Easy optic attachment protects lens against high velocity BBs In the Box 40mm Kill Flash Specifications: Compatibility 40mm airsoft rifle scopes Construction High impact polymer Weight 1.8 oz California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov