Simple small reels of corrugated paper, mixed with hessian sacking, cut to fit our smokers. Standard size - 100mm high, 62mm diameter, Large size - 150mm high,93mm diameter (approx. measurements). Due to the hessian sacking, this will last longer than a standard smoker cartridge, ideal for those longer inspections. Using a long match, hold the cartridge vertically, and light the base in the centre. After a few seconds smoke will start to come through the core of the cartridge and the hole in the top. Drop it into the smoker and give it a few puffs until you see plumes of smoke rising. Close the lid and give it a few more puffs. It is now ready for use.