With the UGears Boxes you can build something amazing without any tools. UGears Flexi-Cubus is a mechanical anti-stress puzzle in the form of a steampunk skeleton cube made out of eight joint-connected spheres. The Flexi-Cubus is designed as a means to improve your attention and focus on a task you are working on. Includes step-by-step instructions with color pictures. 144 pieces, approximate assembly time is 1 hour. Perfect STEM activity.