Produces clean, nontoxic, oil-free smoke to quickly find air-flow leaks in heat exchangers, air ducts, chimneys, tanks, boilers, and piping. Won't stain clothing or building interiors. Contains no explosives. Also used for fire drills and to test smoke alarms detectors. This listing is for pkg. of 10. Technical Specification Item Smoke Pellets Time 60 sec Volume (Cu.-Ft.) 400 Dia. 1/2 in Length 1 1/2 in Package Quantity 1 Type 60 Second Burn