The SVS Sound Path Subwoofer Isolation System decouples and isolates the subwoofer from the flooring, resulting in tighter and cleaner sounding bass, less buzz/rattle in the room, and fewer complaints from adjacent neighbors in apartments and townhouses. It's the next best thing to sound-proofing! The Sound Path Subwoofer Isolation System works with any brand of subwoofer which accepts screw-in feet. Developed with extensive accelerometer and acoustic measurements, this system features optimized durometer elastomer feet which significantly reduce floor vibration. The Sound Path Subwoofer Isolation System ships in packages of four(4) feet with Four (4) ¼-20 x 20 mm screws. Overall Height: 1.57 inch Shell Diameter: 2.28 inch Foot Diameter: 2.08 inch