Features 1、The product is a metal structure assembly model, the main material is aluminum alloy with anodized surface. 2、Various tools to assemble parts, installation steps and methods basically meet actual industrial requirements. 3、Can be used to improve the user's hands‑on ability and concentration, understand various industrial machines, and study various industrial structures. 4、The entire steam engine is made of metal, using CNC casting process, aluminum alloy oxidized, gorgeous appearance. 5、The car engine is composed of 217 parts, the entire assembly process takes about 3 hours, when assembling, you will understand its working structure. 6、Beautifully packaged, is a great gift for your friends, children, colleagues or family members. Specification Item Type: TECHING 2 Cylinder Engine Assembly Kit Product Model: DM114 Main Material: Anodized aluminum + stainless steel Process: Anodizing Product Size: Approx. 215 x 135 x 210mm / 8.5 x 5.3 x 8.3in Number of Parts: 217pcs Charging Voltage: DC5V Lithium Battery Capacity: 3.7V, 450mAh Charging Time: 2 hours Working Time: 1.5 hours Assembly Time: About 3 hours Difficulty of Assembly: Level IV Suitable Age: 14 years old and above Product Standard: GB/T9254-2008, GB/T17626.2-2006 Product Quality: A Structural Features: 1. Double-acting V-type cylinder structure 2. Overhead camshaft valve control structure 3. Synchronous cam drive mode 4. Traditional crankshaft connecting rod system 5. Single inlet and exhaust valve structure Package List 1 x Engine Assembly Kit(217pcs)