Description : Extremly well - made -- the board is made of high quality metal with fine grinding and surface spray pain . Use high grade alloy stand ; flywheel , air exchange piston , power cylinder liner and hot cylinder liner is made of aluminum fine cars , fine milling , texture and beauty double combination ; axle joints connected with very high precision miniature bearings , stability without lubrication ; this is a very elegant and smoothly . Easy operation . This is a fully functioning engine used as a teaching tool to demonstrate how energy ( heat ) can be transformed into mechanic work . Amazing conversation pieces on your desk & amp ; cool gift ! This model is in the form of loose parts , exercise hands - on ability , and the entire metal structure can be repeatedly disassembled . Size Chart : Size : approx . 16x8x7 . 5cm / 6 . 30x3 . 15x2 . 95 inch Package Includes : 1 Piece Hot Air Stirling Engine 1 Piece Alcohol lamp 1 Piece Bulb : Please allow 1 - 3mm measuring deviation due to manual measurement . Due to the different monitor and light effect , the actual color of the item might be slightly different from the color showed on the pictures . Thank you