Aluminum design to give a more durable frame. Beveled edges does not have any sharp points to harm airsoft user. Material is made to be weather resistant against harsh conditions. Trigger guard provides even more room inside the trigger well when user shoots with gloves. In the Box 1X Trigger Guard Specifications: Manufacturer Krytac Build Aluminum Alloy California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov