High quality, non-marking cart casters for Rubbermaid carts. Fits 4400 series and 4500 series Rubbermaid carts. Listing is for a set of four (4) Service Caster Series #05 casters. Includes two (2) swivel top plate casters and two (2) rigid top plate casters with 5” diameter non-marking thermoplastic rubber wheels. Supports up to 130 lbs. per caster or 520 lbs. total for a set of four (4).