content: This is a fantastic product. I use it for much more than just window flashings.... anywhere a moisture barrier is needed. I also use small pieces to repair tears in building paper before the stucco is applied. My only complaint would be that it's hard to find the ripcord and pick it out of the release on the back. Once you find it and get it started, though, you're on you're way. Grace Construction Products makes a lot of good stuff, and this is one of them.