These soft rubber “TPR” casters feature double ball race swivel. The hard poly core gives the wheel a good capacity while still giving a “soft rubber” ride. Some customers prefer the 3 1/2″ size on the Chicago Dolly due to ease of stacking. 300 lb. capacity per caster.
Pros – Quiet and smooth running.
Cons – Somewhat lower capacity and shorter tread life than hard rubber wheels.