Today 99% of all chairs come standard with dual hard wheel casters which is exactly wrong for hard surfaces. Why? Because hard wheel casters on a hard surface slide instead of rolling and gripping the surface. In time the sliding of these hard casters will wear through the finish of your hard wood floor.
In an ideal world you would have a hard floor chair mat with no cleats/grippers on the bottom and a chair with soft dual wheel casters. The chair mat will protect your floor and the soft wheel casters will grip the mat similar to the way a tire grips the road. Not using soft wheel casters can be a safety issue as the chair may slide out from under you. Soft wheel casters help eliminate this problem.
