Cannon fuse comes on a spool, and thus can be bought in lengths. It is highly useful for when you duct tape about 15 different fireworks together, and then want to se them off all at once without the assistance of a blowtorch. You just loop the fuse around the fireworks enough times to hit every fuse (pay special attention to the bank of 7 Roman Candles that you've taped together - they light at the top, but if you're not careful, the other fireworks will blow the fuse off before it gets around to the Romans.) The finishing touch is to add about 200 black cats draped over the monstrosity. Be careful, you don't want to get in trouble because of the raging fire you've created due to the miscalculation with the fireworks - don't try this unless you're near a lake.