Ugears Stem Lab Variator ★Mechanical 3D Puzzle Kit Model Toys Gift Present Birthday Xmas Christmas Kids AdultsModel size: 6. 6*5*4. 2 in (16. 8*12. 8*10. 6 cm) Package size: 8. 1*7. 4*2. 5 in (20. 5*18. 8*6. 3 cm) Number of components: 104 Estimated time of assembly: 4 hours Assemble it and discover how Variator works. The model kit comes with a QR code to the study guide about the mechanism, the principal of its working, the main characteristics, formulas. It also includes interesting assignments. Dive into augmented reality and look at how the Variator