EFX By Scosche AMT045X Accumat Dampening Material: * Flexible, 0.047" thick, visco-elastic sound-dampening material * Appropriate when there is appreciable vibration energy being dispersed from a structural part of the vehicle * Exudes no odors, has great flexibility, installs easily and stops vibration noise * Use for interior panels, trunks, doors and around speakers * Retail package of four 12" x 12" panels