Sound Shells (also called 'Bangers' or 'Sonic Booms') are the loudest fireworks available in Canada. A Sound Shell is a single-shot firework that launches into the sky and then explodes with a giant bang. In essence, this is an aerial form of the American 'Cherry Bomb'. Sound Shells contain various visual effects, ranging from a rising red flare to a spinning silver butterfly. However, their main purpose is to make tremendous noise! Note: All Large Sound Shells are discounted in 4-Pack Qty. USAGE: One or more Sound Shells can be ignited at the start of a fireworks display as a call to arms, informing the crowd that the show is about to go on. Used throughout a fireworks display, Sound Shells will add punch or excitement and serve as a break between items more visual in nature. For those who love noise, we recommend a variety of sound shells for use throughout your fireworks show!