These casters are designed so that your chair doesn’t roll too freely on a hard surface floor. The kit includes five, black soft casters.
Had been rolling on the hard casters on hardwood for over two years before realizing these were available. I don't find these change the speed of my roll, nor did I want it to, but it is much smoother and much quieter.
Was surprised when they came in because at first glance they look identical to the hard casters, but upon closer inspection there are some visible differences. They didn't seem like they would make much of a difference, but once I had them on the chair it was very noticeable.
Easy to remove the old ones (beware they are quite goopy with grease) and pop the new ones in. Would definitely recommend and absolutely worth the investment.
Soft Caster Kit for Office Chairs
Bought these as I have wood floors. They didn't feel any different from the stock casters on the chair so I was worried and was planning to buy a floor mat, but it's been several weeks of constant use now (12+ hours a day) and I have not yet noticed any scratches on the floor.
Bought 1/4 inch tempered glass chairmat. My Fern's Haworth two-tone wheels were fashionable but rolled just too easily on the glass. The rubberized wheels slow this rolling-off-the-mark down considerably.
Zody chair is rolling smoothly. Shipping was quick.