6 inch Heavy Duty Polyurethane Wheel Caster with Brake, High Capacity
4" Plate Caster Wheels Set of 4 1800LB with Screw Safety Dual Locking and Polyurethane Foam No Noise Wheels,Heavy Duty - 450 Lbs Per Caster: Amazon.com: Industrial & Scientific
VEVOR 2 Rigid and 2 Swivel Casters 4-Pack 6-in Polyurethane Swivel Caster in the Casters department at Lowes.com
Henry Heavy Duty Caster Roller Wheels for Bed Frame, Set of 4 - Walmart.com
2” Heavy Duty Swivel Plate Black Casters | Polyurethane Wheels
Ground Glider Caster with Brake 6" x 3" (2-Pack for R14G & R16RT)