Regin S105 White Emitter Cartridges are an economical and practical method of generating a realistic swirling, non-toxic non-staining. S105 emitters produce 2500 cubic feet of dense, white cloud over a 3-4 minute burn time. The cloud is great for photographic, videographic, or theatrical special effects or remote-controlled RC aircraft and other hobbies. The small-sized emitters light with a match or can be ignited electronically. This premium product is also an excellent tool for testing, duct systems, providing a visual display of air-flow for balancing or leak detection, exhaust air systems, stacks, chimneys, fume hoods, negative air pressure testing, fire drills, film and photography, verification of high efficiency air filter operation, and virtually hundreds of other applications. The smoke contains no zinc or oil and leaves behind no residue. With an increasing emphasis on environmental and safety issues, this is an invaluable, practical and economic tool. Regin S105 Cartridges are extremely stable and have a long shelf life, up to 3 years.