Sold as 1 Each. Reduces both road noise and vibration of low frequency noise from 0 Hz to 1 kHz. Lightweight and super flexibleless than 1/8 in. thick and.47 lbs. per sq. ft. Trims easily with standard razor knife or household scissors. Reduces heat and thermal transfers by over 40%. Self-adhesive peel and stickno glue required. OEM approved; meets or exceeds automotive damping specs GMO149M (General Motors), WSB-M5G58-A1 (Ford) and MS-CD 629 Type C (Chrysler). Interior stays warmer in the winter and cooler in the summer, insulating up to 550°+F. Installs in 1/2 the time versus other brands. Universal applicationcan be applied to firewall, floor pan, tunnel, doors, roof, rear wheel wells, trunk and quarter panels. R value: 7. Does not require surface prep; adhesion guaranteedno alcohol or acetone wash needed, no installation tools required. Includes 30 sheets of 12 in. x 23 in. (58 sq. ft.).