DFRobot Metal Mecanum Wheels with Motor Shaft Coupling are omnidirectional wheels designed for a land-based vehicle to move in any direction. These wheels can go straight, obliquely, horizontally, S-line, and rotate at any angle with zero radius. The Mecanum wheels offer low noise that allows them to move stably and flexibly during operation. These Mecanum wheels feature a diameter of 65mm and are composed of 9 small rollers. These wheels are made of plastic and coated with quality and high-friction silicone rubber, which are rugged and impact-resistant. The Mecanum wheels feature better quality, texture and are equipped with a metal exterior structure that has its own coupling matching with various motor shafts. This makes it easy to install and ideal for smart robot cars.