Ignore that. They sent out a message to all teams at the start of the 2006 season, and they reported the findings of their tests of several of their backing material on the carpet, diamond plate, and ramp.. Its in the white paper's section somewhere. That message aside, I don't think I have ever seen anything grip better than the green brecoflex treads.
edit:
http://www.chiefdelphi.com/media/papers/1772