HOTUT Hand Cranked Marble Run Wooden Model Kits, 3D Wooden Puzzle Mechanical Model Kits, Self Assembly Creativity Marble Run Building Kits, Mechanical Model Building Craft for Teens and Adults

• 【Durable and Smooth】The 3D puzzle marble running model is made of environmentally friendly wooden materials, the pieces are smooth, burr-free, and top quality, you will get a good use experience and you will definitely love this fun trackball game.
• 【Full Packaged Product】This is a self-assembly model kit, everything you need is in the package, you don't need any additional materials. Don't be afraid to get confused among so many details, you just need to assemble it step by step following our instructions, the details are everywhere.
• 【Easy to Assemble】This puzzle has a total of 159 pieces, unique shape, fun assembly, interlocking assembly, no tools required. You may need to carefully pop out the small pieces of wood one step at a time to prevent breakage. NOTE: Woodwork is fragile and requires extreme care when assembling.
• 【How to Operate】This 3D wood puzzle is fun and attractive. Crank the handle to drive the gear in an infinite cycle. Second-stage ball loading device, the second ball loading is more interesting. Manual participation allows you to intuitively feel the transmission process between gears.
• 【Best Gift Choice】Wooden Puzzle Marble Runner Set makes a great sensory stimulation toy gift as well as STEAM and STEM educational toy, definitely a cool model for adults or craft enthusiasts. This is also a rewarding and fun project for teens and adults.