Small Cannon Fuse
"Small Cannon Fuse" works well in most small pocket cannons. It has a 2mm black powder core and a light lacquer coating.
Be sure to keep it in the bag until ready for use and wrap it with tape or foil once you fuse up your fireworks, as burn speed will be drastically affected by any moisture.
1 Quantity = 20 feet
Burns at 25 sec/ft