The Hot Wire Foam Cutter has adjustable collars allowing for clean, accurate cuts in foam. Woodland Scenics recommends using only on SubTerrain white foam which emits no toxic fumes. Use only special nichrome replacement wire. The throat of the Hot Wire Foam Cutter is 4.5" wide by 5.5" deep. Input: 120VAC and Output: 9VAC, 1300mA.