Neovivid Live Double Acting Steam Engine Desktop Model Material : Brass, Cast Iron, Steel and Wood Overall Size : 4" wide x 5" long x 6" high Weight : 1 lb approx. Pressure Range of compressed air/steam : 6 -30 PSI Engine is single cylinder double acting oscillating type with 10 mm bore x 15 mm stroke. Flywheel is 3" approx. and is made of cast iron.