853 Pcs Visible L4 Internal Combustion Ohc Engine Motor Working Model DIY Kit Build a Realistic Engine Model ? Order Yours Today! Experience the thrill of real mechanics with this L4 Inline Engine Building Kit, a runnable mini engine model designed for kids, teens, and adults who love engineering, cars, and hands-on STEM challenges. With 853 precision pieces, this scale model brings a four-cylinder engine to life using transparent components and a USB-powered motor for endless learning and display fun. Features Highlights: ?? Realistic Inline-4 Engine Simulation ? Features a transparent cylinder head, moving pistons, a functional turbocharger, and synchronized crankshaft motion you can watch through the clear cover. A perfect miniature recreation of a real four-cylinder motor. ? USB-Powered Motor Operation ? Runs smoothly with a simple USB connection (no batteries needed). Flip the switch and watch the pistons, valves, and crankshaft cycle rhythmically for a captivating demonstration of real engine dynamics. ?? High-Quality, Safe Materials ? Made from durable, non-toxic ABS and fully certified to ASTM CPSIA standards. Each piece is precisely molded for smooth assembly, structural stability, and long-lasting use. ? STEM Learning Through Hands-On Play ? Enhances understanding of mechanics, physics, engineering concepts, and problem-solving. A great project for STEM classrooms, workshops, home learning, or parent-child building time. ? Perfect Gift for Builders Car Lovers ? An excellent choice for birthdays, Christmas, holidays, and STEM events. Ideal for teens, adults, car enthusiasts, and anyone who enjoys technical builds or collectible mechanical models. Bring real mechanical engineering to life with this USB-powered, transparent L4 engine model ? a stunning, educational piece that?s as fun to build as it is to watch in motion. ? Includes 853 PCS + USB-powered motor (no batteries required) Shipping Return Policy We proudly offer FREE shipping on all orders within the lower 48 U.S. states. Please note that we do not offer combined shipping, local pickup, or delivery to P.O. boxes or APO/FPO addresses. Orders are shipped within 1?3 business days. Once the item ships, delivery typically takes an additional 1?5 business days. Note: Most items arrive very quickly ? usually within 2?4 business days from the purchase date. Tracking information will be provided as soon as your order ships. Customer satisfaction is very important to us, and we want you to have a great experience. If there are any issues with your order, please contact us directly before opening a case or requesting a return. This allows us to resolve the matter quickly and provide you with a return authorization if needed. We proudly offer 30-Day Free Returns for your convenience.