Stinger RKX36B Roadkill Expert Series Sound Damping Material Bulk Pack Self adhesive butyl rubber anti-vibration membrane w/ aluminum layer Minimum Thickness:0.080inch, Minimum Weight:0.65 Pounds/ft2, Aluminum Layer- 6 mils (9) of 18" x 32" sheets. Total Square Feet: 36 sq. ft. Increased amplifier output Easy cut and apply installation