Usage Tips:Feature: 1. PU Material: The wheel is made of environmentally friendly PU material, non slip and wear resistant, and can be used for a long time. 2. Large Load Bearing: The thickness of the wheel hub is 40mm, and the thicker design makes it have strong load bearing capacity. 3. 608ZZ Ball Bearing: Using 608ZZ metal ball bearings, the solid wheel runs smoothly and is safer to use. 4. 7in Diameter: The wheelchair solid wheel with 7in large diameter ensures quick moving and great stability. 5. Multiple Usages: The 5 hole wheel hub is suitable for wheelchairs, rollators, walkers, etc., easy to install and replace. Specification: Item Type: 7in Solid Wheel Material: PU Material Diameter: Approx. 170mm Tire Thickness: Approx. 28mm Wheel Hub Thickness: 50mm (There may be small error in manual measurement.) Package List: 2 x Wheelchair Wheel Note: Please match the appropriate size before use.