Welcome to the store! 1. Each wheel must undergo 3 inspection processes from material to wheel to ensure a 99.9% pass rate. 2. The outer surface of the wheel has an artificial wheel shape, the color is yellow and black, and the appearance is more three-dimensional. 3. The rubber-coated wheel is made of rubber, which has the characteristics of smooth running and better grip. 4. Allows the four-wheel-drive smart car to realize left and right translation, large-angle drift, 45° oblique directional movement, square track movement, and other movement modes. 5. This Mecanum wheel is compatible with building blocks and for TT motors. Item Type: Mecanum Wheel Material: ABS, Rubber Purpose: DIY Smart Car Accessories Diameter: Approx. 80 mm / 3.1 inches Coupling Type: For TT Coupling 1 x Left Wheel 1 x Right Wheel Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!