If you watch the most recent SnakeBytesTV Brian also states that the Derma ball was 80 to 90 percent scaleless the ones he cut today are 100 percent scaleless. I just wanted to throw that in, I haven't read a lot of things about the Derma ball but that's what Brian said in the most recent episode. I hope that helps clarify things a little better.
http://m.youtube.com/watch?v=58C6XU_h6c4
~CRR