Hand-Cranked Dual Counter-Rotating Tread Mechanism - Kinetic Mechanical Desk Toy | STEM MOC Kit [ideas2goods]

Turn the hand crank and watch mechanical magic happen! This Dual Counter-Rotating Tread Mechanism features nested inner and outer continuous tracks that spin in opposite directions simultaneously. Powered by an ingenious gear transmission system, it’s a captivating demonstration of mechanical physics and a satisfying interactive fidget gadget for your desk.