Artillery Shells - Are fireworks shells that range in size and effect. All of our fireworks artillery shells come either preloaded in a tube or if they are reloadable, then they come with their own tube. The tubes are made of cardboard, fiberglass or H.D.P.E (High Density Poly-Ethylene). The reloadable shells can be purchased up to 1.75" and the preloaded fireworks shells can be up to 3".