Car Builders Stage 1 Sound Deadener Is a Vibration (Sound) Dampening Mat It consists of a butyl rubber noise absorption layer combined with an aluminium top layer. Each box has 12 sheets, each sheet is 300x500mm and 2mm-2.2mm thick. Car builders butyl based sound deadener does not require heating, does not smell and will not go brittle over time, which are all qualities of old style tar or bitumen sound deadening materials. Car builders sound deadener has pressure sensitive butyl rubber, which is inherently sticky eliminating the risk of an adhesive layer failing. Applications: Under Carpets Roof Skins Inside Cavities 1/4 Panels Doors Boots/Trunks Firewalls Sound Deadener Comes Packaged In 1.8sq/m (20sq/ft) Boxes: 12 sheets per box 2-2.2mm thick Sheet sizes is: 300mm x 500mm All Our Colour Options Are the Exact Same Sound Deadener - Same Price, Same Size, Same Butyl Rubber. It Is only The Colours that Is Printed on The Top that Changes. Silver - Silver with Black Logo Black - Black with Silver Logo OEM Black - Plain Black No Logo Features/Advantages: Easy Installation - Just Peel Off the Release Liner and Roll It On 100% Waterproof - Does Not Rot or Deteriorate Cuts with Scissors or A Knife Reduces Heat Transfer Conforms and Fuses Easily to All Types of Sheet Metal No Odour Specifications: Appearance: Black Butyl based core with silvery aluminium reinforced layer backed with white wax paper release liner. Thickness: 2.0 - 2.2mm Weight: 3.2kg/p sm Acoustic Loss Factor: (ASTM method E756 @ 200Hz, Temperature range -10°C to +60°C) 0.08 to 0.41 Recommended Install Temperature: -10°C to +60°C Resistance Temperature Range: -40°C to +149°C Chemical Resistance: Resistant to water and mineral oils Adhesive Peel Strength: 65N/cm on cold steel Storage: Product should be stored at room temperature for best application and should be stored horizontally in its package.