Foo........good question I forget where I bought that cork and for the future I'm not sure where I'll buy. It is hard to find decent cork over the internet because you cant phyically see it and due to the fact that there is no standards placed on cork grading.........one guys flor grade may be another guys extra select............or worse. There needs to be a standard , and I think you'll find all builders would agree with that statement! the problem is setting it up as well as enforcing it.........Ed