The MultiZorber II offers the lightweight quality of foam with the acoustic performance of fiberglass. The new fabric front allows for greatly enhanced mid and high frequency absorption, along with a more refined look than the original MultiZorber. Features include:· 2 inch. - 2 pcf density fiberglass with nylon sailcloth on the back and Guilford FR701 fabric on the front · Portable acoustic environment · NRC 0.90 against a wall or ceiling · NRC 1.35 as a free-standing baffle · No adhesive or impaling clips needed · For easy, damage-free-hanging on a wall, try the 3M Command Wire Hook, 5 lb rating (Model 17069) · Mounting options: offset from a wall, hang in free space as a baffle, install in a corner as a bass trap, hang from a ceiling · Class A fire rated, made in the USA