FLAT-FREE SOLID PU TIRES: Made of solid polyurethane (PU), these 10-inch flat-free tires will never puncture or deflate. No more dealing with flat tires – enjoy maintenance-free wheels that keep your cart moving on any terrain.HEAVY-DUTY STEEL HUB: Built for hard work, the reinforced steel hub and solid rubber wheel construction ensure durability and stability under heavy loads. The premium steel rim resists bending or rust, providing reliable performance for hauling tasks.UNIVERSAL FIT – 5/8" & 3/4" BEARINGS: Includes 5/8-inch and 3/4-inch bearings plus a spacer kit to ensure a perfect fit on different axles and hub lengths. This universal design makes replacing wheels on carts, wagons, and equipment easy.SMOOTH ROLL & TRACTION: Quality pregreasead ball bearings and a non-slip tread help these flat-free wheels roll smoothly on grass, gravel, or pavement, so your loaded dolly or wagon moves with less effort and greater stability.WIDE APPLICATION: This 2-pack of 10-inch flat-free wheels is an ideal replacement for wheelbarrows, garden carts, utility wagons, hand trucks, dollies, and more. Quickly swap out old pneumatic tires and never worry about flats again.