https://www.youtube.com/watch?v=jEv7TZPAgZc I created this video because so many customers call/email and want to know what comes in the 40 pound mix box of B Stock Damplifier/Damplifier Pro. The product contains trimmed factory error pieces of both Damplifier and Damplifier Pro, we try to keep it more Pro than regular, the pieces are hand trimmed to remove any unusable pieces and it results in a great discounted box for dampers on a budget. The B Stock does contain pieces that may have wrinkles, uneven edges, and/or +/- 25% butyl rubber thickness but are still made from the same high quality 100% American made butyl rubber and 6.5 mil foil as the A Stock Damplifiers. B Stock products are not always in stock as they only are available upon factory errors, but they do come back in stock in burst throughout the year so always check back if they are out of stock when you first check. The 40 pound B Stock box can be found and purchased here at: http://store.secondskinaudio.com/damplifier-damplifier-pro…/ In this project I used about 15 pounds of the 40 pounds of B Stock. I only did single layer coverage as I do not have a loud bass system or loud exhaust in this vehicle. The 40 pound Box can cover between 60-90 sqft enough to the average sized car floor, doors, and trunk area. Second Skin For The Win!!!!