EZ Moves Permanent Furniture Slides for Carpet has an ultra-smooth base for easy movement over most carpeted surfaces; even thick shag! They are designed to be left permanently under the furniture leg to facilitate frequent moves.
Made from high density 1/2″ thick EVA foam which conforms to anything placed on it. The weight of the furniture is all that is needed to keep the sliders in place. The slides are 3" x 3" square and are sold in sets of four.