PACKAGING IS DAMAGED.Ballistic Door Kit 4 Pieces 12X36 . 12 sq. ft. (12 x 36 ) 4 pieces of butyl sound dampening material – Increases bass output and enhances speaker quality – Eliminates speaker distortion road noise and rattle – Can also be used for doors trunks trunk lids interior panels floorboards etc – Three-step easy installation – Dimensions: 36 L x 12 W