eye-worthy rubber material: the suitcase wheels are made of one-piece rubber material, which is cheap and not oil-resistant. It has good water resistance. When the hardness is less than 70, it has good elasticity. When the hardness is high, it has poor compressibility. Double bearings, strong bearing capacity and wear resistance: the suitcase wheels have better wear resistance and aging resistance. It has double bearings and rotates flexibly. One suitcase wheel can carry a load of 50 kilograms and the sound fits well with the scale. Package contents: Suitcase wheel set contains: 2 wheels, 2 axles, 2 axle bolts, 4 washers, 2 keys. Wheel outer diameter: 50 mm, wheel width: 18 mm, total wheel width: 21 mm, inner diameter rollers: 6 mm, if: 33 mm, 36 mm. Easy to install: the case wheels are easy to assemble and can be installed yourself. When installing, pay attention to the tightness of the wheels, so that the suitcase wheels can roll better. Tip: Buying new luggage is a waste, but it is a very cost-effective way to extend the life of your luggage if the wheels break. Before you place an order, measure the wheel data of your case and choose the correct wheel size.