I'd pretty much consider these a must for the intermediate-to-advanced climber. My wall at home is about 25 degrees overhanging, and these holds are tough! I'd rate/grade these holds around V4 to V6 on my wall. The description on the product's page is accurate, and as described, they do have a slightly rounded upper edge for crimping. Considering that, I'd recommend also buying a pack of straight-edge crimps to go along with these oval crimps.