Set of Four 4" Penn Elcom Casters 2 Swivel W/Brake 2 Rigid- Blue Rubber Wheel (Set of Four 4" Penn Elcom Casters 2 Swivel W/Brake 2 Rigid- Blue Rubber Wheel): Amazon.com: Industrial
Penn Elcom 64mm / 2.52" Non-Rattle Recessed Black Castor (Steel) W2060Z PennElcomOnline.com
Penn Elcom W0990/80 Blue Wheel 80mm
Penn Elcom Casters with for Heavy Duty Roadcases, Flightcases, and Heavy Equipment (1 Automatic Swivel Caster): Amazon.com: Industrial & Scientific
Set 4 Penn Elcom 5295 2" Plug-In Replacement Fender Amp Casters Wheels & Socket | eBay