Caster Wheel, Hard Rubber Tire, 8″ x 1″- 2 3/8″ Hub Width; Fits Most Sunrise, Medline, Drive, Invacare, E&J, Guardian, ALCO & Other Manual Wheelchairs (Black, 7/16″ Axle, Wide Hub) One Pair 8 inch x 1 inch caster wheel with solid rubber tire.