Design Engineering 050200 Boom Mat Sound 2mm Damping Material with Adhesive Backing, 12" x 12.5" (Pack of 2) Eliminates low frequency noise problems and only requires 25-50% coverage for optimal performance High performance adhesive maintains adhesion throughout temperature extremes Flexible material is easy to install - trim to size with Boom Mat Blade Lock Knife (sold separately) The industry standard in vibrational damping technology with multiple uses including automotive, commercial and industrial applications Durable weatherproof construction is also corrosion resistant 40% + better damping performance above 75F; Maintains adhesion from -30F to 400F Multiple uses including automotive, commercial and industrial applications Low frequency damping; Mid and high frequency barrier Non hazardous material; Bonds to irregular and contour shaped surfaces No surface preparation required; Trim to size with scissors or knife, peel backing and apply