Although most commonly referred to as artillery shells, there are other names used to describe this item such as mortars, festival balls, canisters, ball shells and reloadables. All of these terms refer to a shell shaped firework that is placed into a tube, fired as a single shot then reloaded with another one.
Artillery shells can have various effects and multiple breaks. They come in various strengths depending on the desired effects. The most powerful artillery shell available in consumer fireworks is a 60-gram canister shell. There are also smaller ball and canister shells that have unique effects and vibrant colors. That is the great advantage of artillery shell fireworks - you can pick your desired outcome in power and effects.