1、Strong Material: Our wheel replacement are made of iron bearings and rubber wheels to ensure maximum density and strength, providing reliable long term use. 2、Water Repellent: The wheels are made of a special waterproof compound and are reinforced with uniform fibers to provide excellent service even in wet and cold applications. 3、Erosion Resistant: The wheel is resistant to degradation, deterioration and erosion from oils, greases, commonly used acids, and solvents, ensuring long lasting durability in various conditions. 4、Wheel Size: Our wheels come with a 20.3 mm center hole, 200mm rim length, 48mm rim width, and 1100 lbs strong capacity. 5、Easy Installation: The jack wheel is designed for simple and convenient installation on jack stands, enhancing the mobility and stability of your trailer RV.