I bought the 40 square feet package. I opened it up and was amazed how thick n beefy it was. I have a tahoe and it did all 4 doors,the tailgate and side wheel wells and have a sheet left over. I recommend this over any other dampening material out there. My doors are HEAVY now like a tank solid. I dont notice any rattles but my bass is so loud i wouldnt hear it anyway,outside the car yes but not any more. Its thicker and may take some extra elbow grease to get in all the corners but what a fine product, i recommend this to everyone. My music does sound better too, a must have for everyone.This is the thickest,and best on the market IMO!