Features 1、8in Diameter: The wheelchair wheel with 8in large diameter ensures quick moving with great stability. 2、PU Material: Adopting premium PU material, the caster is skidproof and wear resistant during rolling. 3、Ball Bearing: Equipped with metal ball bearing, the tire enables smooth rolling and great durability. 4、Thickened Hub: Thickened wheel hub is not easy to deform, which also has great load bearing capacity. 5、Broad Using: Suits perfectly for wheelchair, walker, rollator and so on, very easy to install as well. Specification Item Type: Wheelchair Wheel Material: PU Material Diameter: Approx. 197mm / 7.8in Tire Thickness: Approx. 23mm / 0.9in Wheel Hub Thickness: 50mm / 2.0in Bearing Model: 608zz Bearing Hole Diameter: Approx. 8mm / 0.3in Bearing Outer Diameter: Approx. 22mm / 0.9in Bearing Thickness: Approx. 7mm / 0.30in (There may be small error in manual measurement.) Package List 1 x Wheelchair Wheel