When the bed is moved, the hubcaps slide out and certainly do not protect the floor. The material just isn't stiff enough to keep the bed from rolling. However, once you get under the bed and put all the casters back in place, they work fine unless something happens to move the bed. In the last 6 months we have had to repair the hubcaps 2 or 3 times. Your mileage may vary, and if you have "legs" rather than rollers, they will likely work just fine.
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