Description: Mechanical Rail Model: This wooden mechanical rail model contains 248 parts, which need to be assembled by yourself. High Quality Material: Made of high quality wood material, it is strong and durable, with excellent workmanship, the surface is smooth without burrs, and does not hurt hands. : The dual choice of solar energy and electric power allows the steel ball to drive in an infinite loop, and the multi layer suspended spiral tracks are superimposed layer by layer. The unique design brings you a new gaming experience. Educational Toys: Help to develop the brain, cultivate children's innovative hands on ability, enhance the ability to scientifically explore knowledge, cultivate creative thinking, and stimulate children's interest in learning and curiosity. Easy to Assemble: Assemble according to the instructions, without glue and other tools, you can complete this three dimensional puzzle model with your child and enjoy the fun of DIY. Specification: Material:Wood Size Chart: After Assembly: 160x195x285mm/6.30x7.68x11.22inch Package Includes: 1 Set Wooden Puzzle Materials (248 Pieces) 1x Manual Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!