I don't know about "black pebble grip" as Darkstar and Sudsrat mention. Its the "flocked" grip (I think Loomis used it on their factory rods) people say tears their hands and wears a hole in their waders.
every grip has a purpose. what is preferred by some is not preferred by others. so, you have choices. that's what makes custom rods, custom - choices and they are built for you, not the masses.