Feature: 1. Each wheel has to go through 3 inspection processes from material to wheel, which can ensure a 99.9% pass rate 2. The outside of the wheel is an artificial wheel shape, the color is yellow and black, which bring more three‑dimensional appearance 3. Rubber‑coated wheel, which has the characteristics of smooth running and better gripping ability 4. Four‑wheel drive smart car can realize left and right translation, large‑angle drift, tilt 45° direction movement, square track movement and other movement modes 5. This robot Mecanum wheel is compatible with building blocks and for TT motors Specification: Item Type: Mecanum Wheel Material: ABS, rubber Purpose: DIY smart car accessories Diameter: Approx. 48mm / 1.9in Coupling Type: For TT coupling. Package List: 1 x Left Wheel1 x Right Wheel Note: 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.