Auralex U-Boat - Construction Floor Floaters. 50 or 300 pack. Made of a specially-formulated rubber compound, U-Boat Floor Floaters are our proprietary U-shaped channels used to support framing members and float (isolate and decouple) them from the surrounding structure. With the help of U-Boats, a floated room features greatly improved transmission loss (isolation) and low frequency definition (translated: a tight, floated room will always sound better!). U-Boats are the industry’s most affordable floating solution and are much easier to use than those exorbitant “pucks” that have been used in the past. Technical Details: Size: 2 1/8″ wide x 1 1/2″ high x 2″ long; Colour: Black; Thickness: sides=5/16″ and base=1/2″; Box Quantity: Available in lots of 50 or more