Package Includes 10 sheets 1 sqft (12" x 12") GTMAT ONYX BUTYL , 2 GTMAT Decals, Easy to follow Installation Instructions, Toll Free Tech Support * GTMAT ONYX Sound Deadener adheres to almost any surface instantly, and is pressure sensitive. The harder the pressure of application, the stickier the bond. Clean, grease-free surfaces provide the most durable applications. In general, the warmer the temperature, the tackier and more pliable the adhesive will be when handling and applying. Recommended application room temperature is between 50°F to+120°F (10C to 50C). * GTMAT ONYX Sound Deadener has a superior temperature adhesion range that is much higher than the leading discount dampener or hardware store variety products. Consider this feature when using sound proofing in hot weather, or in heated automotive areas such as hood or firewall - You definitely do not want to use a mat that does not stick! * GTMAT ONYX Sound Deadener is an extremely durable product. Rated at 20 years fail-free for exterior use, this product will deliver a lifetime of service in your automobile. GTMAT ONYX is water, oil, solvent, salt, rust, and heat resistant. * 4 Mil Aluminum Shield, Sound AND Heat Insulation, Massive DB & SPL Gains, Overlap Layers for Additional Vibration Dampening, Flexible, Pliable, Malleable, Kill Unwanted Noise, Rattles, Vibrations, Impressive Bass Improvement. GTMAT ONYX Sound Deadener is a self-adhesive insulator coating that consists of a butyl laminated to a protective layer of aluminum.