Hold the central Lego Technic Gears between your fingers and flick the outer wheels to create a fast-moving spinner. Or, you can pinch an outer wheel and hurl the assembly around inside your palm. The wheels and tires add heft to the spinner so that it has momentum. Try your own designs!
I used more common wheels and extended the center axle. When just holding the gears the friction would be to great to allow spin, so I just used a longer axle which should be held. Don't forget to like this MOC, I am sure the designer would appreciate it.