Welcome to our store! 1. Each wheel undergoes 3 inspection processes from material to wheel, ensuring a 99.9% pass rate. 2. The wheel exterior features an artificial wheel shape, with a yellow and black color scheme for a more three-dimensional appearance. 3. Rubber-coated wheel offering smooth running and better grip. 4. The four-wheel-drive smart car can achieve left and right translation, large-angle drift, 45° inclination movement, four-wheel drive, and other movement modes. 5. This Mecanum robot wheel is compatible with building blocks and TT motors. Item Type: Mecanum wheel Material: ABS, rubber Purpose: DIY smart car accessories Diameter: Approx. 48 mm / 1.9 inches Coupler Type: For TT coupler 2 x left wheels 2 x right wheels Your 100% satisfaction is our top priority. We will provide you with the best service. If you encounter 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!