Amazon.com: Slipstick CB681 2 Inch Floor Protector Rubber Caster Wheels (Set of 4) 5/16 Inch Stem or Top Plate Mounting Options - Black/Gray Green : Office Products
Rubber wheels and rubber castors | Blickle
Moogiitools 4 Pack 1" Small Caster Wheels for Furniture Low Profile Soft Rubber Casters Swivel Plate
Colson Polyurethane Heavy Duty Swivel Caster 8" Top Lock (1000 LBS Cap)