The listing is for a set of four (4) service caster series #35 casters, two (2) swivel casters with side lock brakes & bolt-on swivel locks and two (2) rigid casters, with 5" diameter by 2" wide v-groove cast iron wheels, maintenance-free precision ball wheel bearings. Capable of supporting a total weight of 4,400 lbs. (1,100 lbs./caster).