QWORK 2 Pack 5" x 1.5" Premium Rubber Wheel with Ball Bearing, Hand Truck Wheel, Capacity up to 88 lbs - Amazon.com
6 Inches Heavy Duty Rubber Caster Wheels Anti-Skid Swivel Casters Wheels with 360 Degree for Set of 4 (2 with Brakes& 2 Without): Amazon.com: Industrial & Scientific
Amazon.com : Solid Rubber Wheel, 8 in Dia, 500 LB, Black Pack 2 : Office Products