Item Type: Mecanum Wheel_x000D_ Material: ABS, rubber_x000D_ Purpose: DIY smart car accessories_x000D_ Diameter: Approx. 48mm / 1.9in_x000D_ Coupling Type: For TT coupling 1Each wheel has to go through 3 inspection processes from material to wheel, which can ensure a 99.9% pass rate 2The outside of the wheel is an artificial wheel shape, the color is yellow and black, which bring more three?dimensional appearance 3Rubber?coated wheel, which has the characteristics of smooth running and better gripping ability 4Four?wheel drive smart car can realize left and right translation, large?angle drift, tilt 45 direction movement, square track movement and other movement modes 5This robot Mecanum wheel is compatible with building blocks and for TT motors 1 x Left Wheel 1 x Right Wheel Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.