These are very interesting holds. They really are best suited for overhanging terrain for sure. You get 1 to 1-1/2 finger pads behind them which is a lot for a crimp. This means on vertical the low profile nature of these holds kind of feels like it traps your fingers between the hold and the wall. A "newbie" climber using these on vertical should be cautious if they plan on burying their fingers in them as the move up. A foot slip in this situation could sting a little on the fingers. So, the solution is, don't set them on vertical terrain :-) On overhangs they are sweet, sweet, sweet. Definite finger strengthening.