This allmetal engine model kit contains more than 150 precision parts, including 12 rolling bearings and 30 stainless steel bolts, designed for handson learning, demonstration, and display. Key benefits Learn by doing: Assembling and operating the model reveals the internal mechanics of an engine, helping to build practical skills and deepen understanding of mechanical and physical principles. Durable, smooth performance: All moving parts are supported by rolling bearings for reduced friction and reliable motion. The base features doublelayer spring shock absorption for smoother, more stable operation. quality materials: Cylinder pistons are precision ground from alloy steel for tight clearances, hardness, and strong wear resistance. The heat sink is made from density aluminum alloy to increase heat exchange efficiency. Compact and reliable design: Constructed entirely of metal, the kit has a compact structure with reliability suitable for repeated assembly and operation. Features and specifications Total parts: more than 150 small components, including 12 rolling bearings and 30 stainless steel bolts. Materials: alloy steel pistons, density aluminum alloy heat sink, stainless steel fasteners, and metal structural components. Mechanical support: all moving elements are inlaid with rolling bearings; base uses doublelayer spring shock absorption. Function: working mechanical model that demonstrates piston, crankshaft, and heat dissipation behavior in a compact format. How it solves common needs Educational demonstrations: Makes abstract engine and thermodynamics concepts tangible for students and hobbyists. Reliable practice unit: Robust metal construction and precision parts let users practice assembly, maintenance techniques, and diagnostic observation without fragile components. Smooth operation for observation: Bearings and shock absorption minimize vibration and friction, enabling clear observation of component interactions. Use scenarios Classroom or workshop: Use the kit for physics or engineering lessons to demonstrate piston motion, crank mechanics, and heat transfer in a live setup. Hobbyist assembly and display: Build and run the model as a handson project to explore mechanical principles and add a working display to a collection. Skills training: Practice precision assembly, fastener use, and troubleshooting on a durable, reusable model. What you receive A complete set of over 150 parts, including 12 rolling bearings and 30 stainless steel bolts, ready for assembly and operation. This kit is intended for educational and hobbyist use to illustrate engine mechanics, improve practical skills, and provide a durable, performance working model.