The audio guys call it "Dynamat" . It has a sticky side with a flim you peal off to apply to a flat surface. There are a couple thickness avalible and a similar product in a spray can. .070" x 19.5" x 32" is $19.95 mail order from www.eastwoodcompany.com 73, Kurt W7QHD (since 1951) web page: http://W7QHD.tripod.com