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. Dynamat Xtreme Door Kit Part Number: # 10435 Contents: (4) 12" x 36" (305mm x 914mm) pieces of Dynamat Xtreme