200×50 (8″ x 2″) caster with 5/16″ extended race bearings. Quantity : One ( EVA Solid Rubber Material) High quality grey high-tech polyurethane materials , Flexible, walking mute effect is good, have a certain wear resistance, suitable for use in various environment. Rubber wheel can be used to replace the wheels of the wheelchair broken. These fit most electric wheelchairs with 200 x 50 (8×2) casters tires with 5/16″ installed bearings. Tire Size: 8″x2″ (200×50),Total width from bearing to bearing is approx. 2 3/8″,Solid caster tires with rims and 5/16″ bearings, Bearing: 608ZZ, Heavy duty bearings,Satisfaction guaranteed