Bolo shells are a type of shotgun ammunition that use two metal balls connected by a wire instead of small spheres of metal or a solid projectile. They are strictly self-defense rounds intended for inflicting serious injury, such as severing a limb, and are not very accurate over long distances. Bolo shells are banned in some states due to their alleged damage potential. The cost of firing a bolo shell is also high, with each pull of the trigger costing $4 to $5. While bolo shells are primarily used in shotguns, there are also versions for handguns.