CMI's Ultrascenders are designed to be the most convenient and easy to use ascenders around. They've added a new ergonomically designed safety mechanism which is integrated into the handle channel for maximum ease of use in those long "over the lip" stretches. There's a thumb notch in the cam top to simplify full cam retraction, and a molded handgrip for maximum comfort on those long pulls. The cams in CMI's Ultrascenders are 4140 chrome-moly steel. This high strength material allows for the patented, non-metallic finish to the cams. This finish gives the cams the same corrosion resistance as stainless steel yet increases both the tensile and yield strength. Additionally, this finish is harder than the best knife blades or files. Team these features with CMI's extruded and machined bodies, stainless steel springs and operating parts, and you've got the best ascender available!