Mortar fireworks, reloadable shell kits — po-tay-to, po-tah-to. Reloadable shell kits contain a set of mortar fireworks and a tube that can be loaded and reloaded with the fireworks packaged in the set. Usually, there are six or more shells, and each has a long fuse that extends over the top of the reloadable tube. Each of the reloadable shell kits comes with at least one tube that can be reloaded with the mortar fireworks that came in the package. The tube comes in different materials such as cardboard, plastic, or even fiberglass. The shell (or mortar fireworks) is placed into the mortar tube that is in the reloadable shell kits. It has a long fuse which when ignited, sets off a black powder charge that propels the mortar fireworks over a hundred feet into the sky. When it blasts, it puts on an impressive display. Different types of mortar fireworks create different kinds of displays. Some are sparkly, some have a host of different colors, and others produce the classic shapes usually seen at fireworks displays.