The Sanus Systems Foundations Ultimate UF30 is a 30" Tall Speaker Stand (Pair) for medium-to-large bookshelf speakers up to 25 lb. Its stable triangular base is made of minerals, resins and glass for superior resonance damping. Three textured gray steel pillars support a 6 x 6.5" steel top plate with brass speaker isolation studs for a stable, non-slip surface. Pillars can be filled with shot for added mass and have damping rings at both ends to effectively isolate vibrations. Base includes carpet spikes and pads for use on any floor surface.