This is a Deluxe set of 4 replacement smoker heating elements, wicks, crimps, and a small bottle of fluid for most petroleum based smoke units. These are for for Aristocraft Polk Hobbies G scale trains. CREST or JTS Mega Steam also works for these, Smoke generator Instructions that are on the back of the double sided leaflet that will be included.The included sample bottle of G.I. TANK AND MODEL SMOKER FLUID works great for these. Smoke Fluid is only included for shipments to the United States. It is NOT included for International purchases.Smoke generator Instructions that are on the back of the double sided leaflet will be included. All elements have been tested with good resistance, and as being in working condition. There may be some residual smoke fluid on them as a result. See photo of amazing amount of smoke coming off with 7.2V with Fluid. Comes in replacement (not original) packaging, with a leaflet on the 0-4-0 Steam Locomotive. These are for many fan driven Smoke Units that run off 7.2V-18V. These elements will fit the ARISTOCRAFT TRAINS 29311 SMOKE UNIT ART 29311: Aristo Craft Fan Driven smoke system for the SD45, Pacific, Mikado, etc. There are some slight bends in the leads from storage, as seen in photos. Every single element has been tested to ensure proper operation.