CasterHQ 10" x 3.5" Swivel of 4 Set Pneumatic Caster - 4 PLY - 350 LBS PER 1400 LBS PER Set Capacity - Air Filled - Commercial/Industrial Application 10 inch x 3.5 inch Shock Absorption: Amazon.com: Industrial & Scientific
6PPNTR 6" Rigid Pneumatic Wheel
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6 Inch Pneumatic Caster Wheel Set with Small Top Plate: Amazon.com: Industrial & Scientific
12" Pneumatic Caster Set of 4 - 2 Swivel with Bolt-On Swivel Lock/2 Swivel with Brakes - Black Rubber Wheel - 1,800 lbs. Capacity - Service Caster Brand - Walmart.com