Children Wooden Mechanical Gear Perpetual Calendar 3D Puzzle Model DIY Assembled Toys

1. Main material: wood
2. Weight: about 80g
3. Dimensions: 9.5×10.5 cm
4. Production process: laser engraving
5. The mechanical transmission perpetual calendar is composed of many precision parts, and through the combination of multiple sets of gears, a beautiful perpetual calendar created by mechanical transmission is created
6. There are planet wheels and rotating gears inside to find the correspondence between the date and the week, which is fun and practical
7. Can query any day in 2017-2044