Versatile use for drinks, plants, or decor, suitable for indoor and outdoor settings. Super-absorbent coasters made from natural diatomaceous earth, absorbing 2-4 times their volume in water. Sturdy design with silicone non-slip pads for ultimate grip on surfaces. Effortless maintenance; simply sand lightly with included sandpaper to refresh the . irregular shape adds modern flair while preventing , spills, and scratches on furniture.