This is 12 gauge Short pepper blast shells. This ammo will shoot out a thick cloud of pepper spray when fired. This ammo will fill a 600 square foot building up with pepper spray. It will temporarily blind anyone in the building. It will also make them gasp for air. Needless to say anyone in the building will definately come out in a hurry. It is devatating if it is fired directly at someone. It will paralyze them for hours. This ammo is designed to be fired in a 12ga. flare gun, but will function in any 12 gauge weapon that will feed mini-shells. This ammo will not permanantly injure someone, but it can cause serious pain, so use with caution.