Do I still need to use a plastic floor mat with these wheels?
If you plan to use these on a hard surface, you will not need a floor mat. Our chair wheels are encased in soft, polyurethane material and will not scratch or leave marks on any surface. This includes hardwood, tile, laminate, vinyl, pergo, and all other surfaces.
If you are using these on a plush/shag carpet (thick carpeting), you may want to keep the floor mat for some extra ease of movement in your chair. (Wheels were never meant to roll well on thick carpet.)