The Unicorn 40mm Airsoft gas grenade shell is made to fit most 40mm grenade launcher and lets players hit more than one target at a time. The shell is made from CNC aluminum for maximum durability. Load the BBs into the top of the shell after you remove the rubber stopper, maximum 20 BBs. Multiple reusable caps come with the shell for player convenience. This reusable shell is powered by Green Gas. The Unicorn 40mm Airsoft Gas Grenade Shell is the perfect addition to any arenal to help you blast your way to victory.