DEI Moldable Noise Barrier - 48in x 54inBoom Mat Moldable(TM) Barrier is a highly flexible . 5lb ft2 sound and moisture barrier designed for those applications where a budget conscious, simple noise control solution is needed. Conforms to the shape of your chassis, or for more intricate areas, can be molded with a heat gun. Even becomes quite flexible by simply warming the BM MD outside on a sunny day. Easily installs with scissors and a heat gun and bonds itself where seaming is necessary.