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The Dynamat Xtreme Door Kit contains four 12" x 36" Sheets of Dynamat Xtreme (12 square feet). Includes enough material for two standard-sized doors (applied to the inner door skin only), or one standard-sized door (if applied to both the outer and inner skin, for superior sound damping and noise reduction). For more details and information on installation, see the Dynamat Door Kit install guide.