4" Thermo-Plastic

400 Series, 4", Thermoplastic Rubber Swivel Plate Caster, 250 LB Load Capacity, Plate Size Of Holes 1.75" x 2.90", Gray Thermoplastic Rubber Tread On Black Polypropylene Hubs, Offers A Soft Cushioned Ride & Are Quiet, Excellent Flat Spot Resistance & Is Resistant To A Broad Range Of Chemicals, Acids, Solvents & Detergents, Non-Marking, Performs Well In Wet & Corrosive Conditions, Very Good Floor Protection & Impact Resistance, Temperature Range 180°ree. Fahrenheit To -40°ree. Fahrenheit, Durometer 80a + -5, Bulk.