Dynamat Xtreme Squared 18 Dynamat Xtreme Squared 18 in a new 18 inch size with a 1-inch cutting grid. Same great Dynamat material with a modern, new look. New 18 inch square pieces for easy installation. Dynamat Xtreme quiets annoying road noise, improves a speaker’s dynamic range, and makes for a more comfortable driving experience. You can quiet down the noise, and get better sound. Pack contains (8) 18 x 18 pieces in a pack for 18 sq.ft. total. pieces of Dynamat Xtreme to reduce road noise so you Hear More Music!™.