Durable 10 inch air-filled rubber wheel fits 5/8 inch axels on hand trucks and carts.About the EZ Roll Pneumatic WheelThe EZ Roll Pneumatic Wheel features 4-ply rubber layering for strength and durability. The advantage of a pneumatic wheel is that i t provides a smooth ride because they are air filled just like a car tire. This is an ideal replacement wheel for virtually any hand truck that has a 5/8 inch axle. Zirk fitting allows you to easily grease the hub as necessary. Load capacity is rated at 350 lbs