40mm Grenade, Full metal and holds 90 bbs and uses green gas. Will fit most standard 40mm Grenade launchers. To load, Simply charge your gas as normal through the valve on the base and pour your BBs into the loading chamber. Plug the chamber with a rubber stopper and you're ready to shoot. When fire it can reach up to 50ft covering a wide area. 10 rubber stoppers are included in the pack, Stopper packs are available.