This deck was roughed far too well. A good Invisible Deck should grip with moderate pressure, then
slide with light pressure. These gripped with the desperate tenacity of a man hanging on to the edge
of a cliff. Even with a delicate touch, these cards were like trying to push apart two pieces of
80-grit sandpaper.
Buy the Harry Robson Roughing Sticks or some roughing spray, and make
your own with the proper moderate grip.