Dayton Audio DRFS1 1-3/8" x 1" Heavy Duty Rubber Feet 4 Pcs. Perfect alternative to cone spikes on tile, stone, or wood floors Interchangeable with Dayton Audio subwoofer systems and accessory spike kits Super-dense 1-3/8&quot; diameter by 1&quot; high rubber feet are durable and never &quot;squishy&quot; Hardware included for mounting in panels up to 1&quot; thick