Ukidz Ugears Monowheel 3D Mechanical Wheel, Wooden Model for Self Assembling, DIY, Brainteaser, Best GiftModel Size: 7. 3 x 3. 7 x 6. 3 in Number of parts: 300 Level: Intermediate Assembly Time: 3 hours Recommended Age: 14+ Package size: 14. 6 x 6. 7 x 1. 3 in Item Number: UTG0058 Dimensions: 14. 8 x 6. 8 x 1. 4 inches Weight: 1. 55 lb The completed model looks great on any collectors shelf, but it does not have to stay there. The durable design allows it to roll over semi hard and hard surfaces, meaning you can enjoy this model indoors and outdoors. It