• Aluminum Alloy Copper Alloy Stainless Steel
• Tribute to the first four-stroke internal combustion engine, with a single-cylinder, four-stroke, 2-valves, dual camshaft pushrod structure, making it a captivating mini handheld craftwork
• Made entirely of metal, with an aluminum alloy base and premium metal parts, the model has a strong mechanical feel and a deep impression
• Realistic operation that simulates the operation of a real engine, with a visualized working process that makes the working principle clear at a glance
• Science education and puzzle toy that faithfully reproduces the working principle of the OHV engine for teaching demonstrations, and a great stress-relieving handheld toy for mechanical enthusiasts
• Pre-assembled model that requires 2 x AAA battery. Please handle with care to avoid damage, store properly, and pay attention to cleaning and maintenance for prolonged use