10425 Kit contains one 18" x 32" piece of Dynamat Xtreme for general use on rear decks, doors, floors and the trunk floors. Dynamat Xtreme is also recommended for trunk lids, roofs, quarter panels and under-hood installations. Self-adhesive. Contents: (1) 18"x 32" (457mm x 812mm) pieces of Dynamat Xtreme Application: Use on rear decks, doors, floors and the floor of your trunk to get more bass, more music, lower road noise and better sound.