10435 Kit contains four 12" x 36" (305mm x 914mm) pieces of Dynamat Xtreme to reduce road noise so you Hear More Music!. Kit includes enough material for two standard size doors. For proper installation, use one of our Dynaroller tools. Self-adhesive. Contents: (4) 12" x 36" (305mm x 914mm) pieces of Dynamat Xtreme Reduce road noice, Hear more sound!Dynamat creates a "sonic barrier" restoring 3, 6, even 12 dB of lost dynamic range Gaining just 3 dB doubles your effective amplifier power. Not only do you up your amp output, you hear more of the sounds you want - like music, navigation systems, video, and cell phones. Dynamat Xtreme is coated with aluminum to make it ideal for high temperature areas such as firewalls and floors - and for high SPL environments. Dynamat Door Kits come in two levels of performance. The Original Door Kit offers the best value for the money. The Xtreme Door Kit controls vibration four times better than Dynamat Original and requires no heat for installation. Self-adhesive.