.22 Long Rifle, Aguila Super Colibri, 20 Grain Lead Round Nose Bullet, 500 Round Brick.Aguila Super Colibri is super quiet ammo that does not contain gun powder but fires from the force of the primer only. Powerful and silent, great for use in urban areas. This is a 20 grain solid lead bullet in a brass case. Will break glass and penetrate hard tin cans. Velocity is 500 fps at the muzzle with 11 ft/lbs of energy and can be lethal. This ammo works great and is intended for .22 handguns only.Will not cycle in semi auto guns.Not recommended for use in long barreled guns as the projectile may become lodged and be dangerous (lethal) if a regular cartridge is shot as a follow up.Will not cycle in semi auto guns. Uses: Indoor training, pest control.