Features: Play with this busy boards featuring hand cranked gears, fostering creativity and STEM learning through hands on exploration of mechanical principles. Crafted from premium natural wood, this DIY gear toy requires no tools for assembly, offering child safe design. Designed for preschoolers aged 3+ and STEM enthusiasts, it encourages parent child collaboration while serving as classroom material for early engineering concepts. Ideal for playrooms or kindergarten science corners, where kids discover physics fundamentals through gear manipulation. Durable wooden structure withstands rigorous play, outperforming fragile plastic toy while nurturing curiosity about mechanics and problem solving skills. Specifications: Component: Wood Size: Approx. 9.6CM/3.78inch Color: 2 Option Quantity: 1 Set Package Includes: 1x Gear Toy note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.