4 Piece Poly on Aluminum Caster Set with Ball Bearings

Listing is for a set of four (4) service caster series #30 casters, two (2) swivel and two (2) rigid casters, with 5" diameter by 2" wide maroon polyurethane tread on silver aluminum core wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 3,600 lbs. (900 lbs. per caster).