Item Type: Mecanum Wheel_x000D_ Material: ABS, rubber_x000D_ Purpose: DIY smart car accessories_x000D_ Diameter: Approx. 80mm / 3.1in_x000D_ Coupling Type: For TT coupling 1Each wheel has to go through 3 inspection processes from material to wheel to ensure a 99.9% pass rate 2The outside of the wheel is an artificial wheel shape, the color is yellow and black, and the appearance is more three-dimensional 3The rubber-coated wheel is made of rubber, which has the characteristics of smooth running and better gripping ability 4Let the four-wheel drive smart car to realize left and right translation, large-angle drift, tilt 45 direction movement, square track movement and other movement modes 5This Mecanum wheel is compatible with building blocks and for TT motors 1 x Left Wheel 1 x Right Wheel