Auralex Acoustics U-Boat Floor Floaters for Sound Isolation, 50 Pack Made of a specially-formulated, vibration-isolating rubber Help improve transmission loss (isolation) Use U-Boats with Sheet Blok to ensure good isolation Molded to fit around the edge of a 2'x4' For best sound isolation, Auralex recommends incorporating the following products into your room construction in the options shown above