Ugears Monowheel ★Mechanical 3D Puzzle Kit Model Toys Gift Present Birthday Xmas Christmas Kids AdultsModel Size: 7. 3*3. 7*6,3 in (18. 5 * 9. 5 * 16 cm) Package size: 14. 9*6. 7*1. 3 in (37. 8 * 17 * 3. 2 cm) Number of components: 300 Estimated time for assembly: 3 hours We hope youve missed unusual and peculiar mechanical models, because here comes the Monowheel rolling in to join your Ugears collection. Browsing through old photo archives we stumbled upon an image of a fun and smart transport device invented in the beginning of the XXth century.