The mortar is the tube that the shell is placed into. The tube is used to fire different types of airborne devices into the air. Mortar fireworks come in different sizes and different types. Like a modern-day cannon, simply drop the shell into the tube and light the fuse. Go one at a time, or stand up multiple mortar tubes in a row, fuses strung together, for a professional-quality performance. Mortar style fireworks add that special pizzazz to any show or display you want to create for an exceptional evening of fun and entertainment with your friends and family.