just as i was raiding my uncle's shop for the ebony i was going to use for my fretless fingerboard, he suggested (he's a cabinet maker) that i might think of using cocobolo. He tells that that it is as hard or harder than ebony. He has a gorgeous piece of cocobolo stock that I could probably get 5 fingerboards out of. I just don't know if the coco is the way to go. Being an upright player also and having gone thru several uprights i know that 99.9% have ebony boards.