Hiwonder Mecanum Wheel 60mm Omnidirectional Smart Robot Car Accessories, DIY Toy ComponentsDescription Mecanum wheel is made of high quality rubber, has big friction force, smooth tire operation process Featuring omnidirectional movement, it allows robots to not only travel forward and backward, but also side to side. Perfect for congested space Compatible with Hiwonder sensor modules Four couplings are included, which is compatible with TT motors Cool wheel shape in black and yellow enhances appearance of your robot project Package