Siless 80 mil (2mm) 10 sqft Car Sound Deadening mat - Butyl Automotive Sound Deadener - Noise Insulation and Vibration Dampening Material (10 sqft) is up for auction in Automotive. The current bid is $5.50, 80% below the $26.95 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.