Typically that are ball or canister shaped cardboard/paper filled with pyrotechnic composition (the effects and color). On the bottom of the shell is a lift charge that propels the shell into the air, that is attached to a long fuse. Artillery shells come with a tube that is used to place the shell. Tube are made from various materials including cardboard, fiberglass, and the best are made from HDPE with a reinforced ring at the base.
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