Features: Has a smooth and even surfaces, high smoothness, effective resistance to deformation and wear, and impacts resistance, and better load-bearing capacity. Equipped with builted in sealed Peilin bearings, it drives smoothly, saves effort, rotating quietly, and rejects abnormal noises. Wear resistant rubber rings reduce the hard impacts between the wheels and the ground, enhances the friction between the wheels and the ground, and improve the stability of the propulsion. Petal shaped hollow designs, fashionable and beautiful, reduces weight, and enhances portability. It can resist friction, collision, and scratching, effectively prevent metal rusting or corrosions. Specifications: Component: Aluminum Alloy Diameter: about 70mm/2.75inch Color: Black/Black Red Color/Black 01/Black Color Pink/Black Silvery Package Includes: 1pc Folding Bike Easy Wheel note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.