The Shepherd Hardware 2-Inch Twin Wheel Caster place or surface on the carpet pile, and move in oppisite directions to minimize carpet fiber twisting.

2 inch diameter black nylon twin wheels with friction stem mount
5/16 inch friction stem is 1-1/2 inches long for quick and secure installation
75-lb load capacity
Twin wheels rotate independently for quick and smooth direction changes and minimal carpet wear
A great choice for replacing broken or damaged casters on office chairs and carts