The AndyMark 4in. Compliant Wheel Nub Bore, Durometer 40A is engineered for the manipulation of rigid objects rather than the movement of robots. This wheel is part of a series designed to create efficient rollers when used on a driven hex axle, facilitating high-performance intakes and internal conveyors. The orange wheel, with a durometer of 40A, offers a balance between compliance and firmness, allowing it to handle variations in objects effectively while maintaining a higher RPM capability. It is specifically designed to integrate with the Nub system.