Ditto JLS. To me, top grain is leather with a smooth, natural top/hair side and the split and sometimes sanded flesh side. I use HO exclusively for my work. I use one of 2 dealers because I know my b grade will be pretty much all usable. I like HO because I know how it is going to tool, mold, and finish. I use whichever one has the best deal at the time. One has a very good flat fate shipping and the other occasionally has free shipping. I do pay a bit more for HO, but I feel it's worth it. You will still have to work around zome problem spots, but I find them pretty minor. I also am trusting my supplier to send quality leather. If I had a tandy or Springfield within 50 miles, I may do things differently being able to see and feel the product. But as always, caveat emptor.