Sold as a pack of 5. 3 minute burn time.
Smoke has same density as surrounding air which makes it easy to see and photograph.
Smoke Bombs are easy to handle and non-explosive. Great for studying exhaust air, smoke stacks, etc. or leak- test duct work, pipelines, tanks, etc.
The smoke is produced by a chemical reaction inside the cartridge. Fuelled by the heat of the flame; the smoke does not come from the flame itself.