DIY Mechanical Track Ball 3D Wooden Puzzle Toy Educational Kits For Children Physics Learning Science Experiment

Features -Working in tandem through gears. Press the switch, the metal marbles will travel along tracks. Loads of fun to rotate the handle and see marbles run crazy on tracks - We offer a detailed how-to booklet for this 3D puzzle, featuring easy-to-follow, step-by-step tutorials. Each wooden part is laser marked with a unique code. A suitable adult wooden model kit for beginners. - This 3D puzzle will wow everyone who sees it. After construction it can be an unique decoration for office or home. - Building the 3D wooden puzzle uses your logic thinking, creativity and eye-hand coordination. Patience is the key to success. It relaxes your mind and makes you forget all the pressure while crafting. Description Material: environmentally friendly wood, plastic and metal components Product Size: 19.8cm x 16.8cm x 10cm Package Size:26cm x 5cm x 18cm