Isolate It!: Sorbothane Acoustic & Vibration Damping Film 40 Duro with 3M Adhesive (0.04 x 4 x 6in) - 1 Sheet High Performance Ultra-Soft Polyurethane Exception Acoustic Energy Insulation Ultra Thin Film Fits Many Different Applications 0.04" of Sorbothane Will Absorb up to 4 dB Thickness Tolerance: +/- 0.010" Durometer: 40 Shore OO