Phenolic wheels from Arbco provide an affordable heavy duty wheel that perform well in harsh environments. They resist water, grease, animal fats, and most acids and alkalies. These wheels are very hard allowing them to roll with ease. As long as the casters are able to swivel these wheels will not mark your floors. If you are looking for an even higher quality Tool Box Caster that offers some added floor protection please checkout our Red Polyurethane Tool Box Casters.