For rugged use and exceptional strength, the CMI Ultrascenders are the obvious choice. These are the strongest ascenders on the market. The large model weighs in at 270 grams each and has a breaking strength of over 5,000 lbs. The smaller size only weigh 180 grams each and have a breaking strength of over 4,000 lbs. Both models features molded hand grips for extra comfort, while both share simple one-handed operation on and off the rope. Combining extruded and machined bodies with stainless steel parts produces a bomber ascender for any usage. Sold in pairs.