Cylinder Diameter : 8mm Piston Stroke : 12mm. Actuating Pressure : 1kg Typical Working Pressure : 3kg Dimension : 50(L) x 40(D) x 65(H) mm. Materials : Brass mainly + Stainless Steel (base plate) Package Contents. Note: The engine will come exactly as the pictures show, all pictures post here are truly captured. 1 x Steam Engine Unit as the picture show.