Perpetual Calendar Model Kits

FEATURES Wooden Perpetual Calendar: made up of 21 pieces of wood. It takes about an hour to assemble. Suitable for children 14 years and older. Young children may need parental help. Safe Material: Made of laser-cut plywood, the wood has a smooth surface and no burrs. Easily pop them out of the frame and follow our instructions to put them together. Wooden material, non-toxic, safe for your children to build and play with. Pedagogical Meaning: Carefully drawn children's wooden calendar lets you keep track of dates forever! Calculations are done mechanically using a complex system of gears. A useful educational tool to exercise children's thinking skills. These attractions would look cute in any child's room. Without Glue Combination： A tribute to the classic art of assembly. The charm of the product is that the whole product is glue free. Water combination,all by spelt group.A small machine,a small world,sense.Take joy from gears and levers. Excellent Home Decor：A