Graphtech now makes picks out of the same material as their tusq nuts. I received some last week. They are excessively slippery. They have raised lettering on both sides but it does not improve the grip very much.
The material actually comes off on my fingers. I'm going to contact their customer service department. Self-lubricating material is great for nuts an bridges, not for picks. They should have known this. I recommend these picks be avoided until they find another material.
I have Tusq nuts on three guitars and I strongly recommend them.