Artillery Shells are fireworks shells that range in size and effect. All reloadable shells come with their own tubes that are made of cardboard, fiberglass or H.D.P.E (High Density Poly-Ethylene). The larger reloadable canister shaped shells are 1.75" wide and contain 60 grams of powder to make them the equivalent of a preloaded 3" shell. They are propelled out of a mortar and may have single or multiple breaks. Artillery Shells are sometimes referred to as Mortars, Reloadables or Festival Balls.