Edelrid's Jul2 Belay Device is a single rope device designed for any climber ranging from beginners in a gym to advanced sport craggers projecting, flailing, and occasionally redpointing. This device has a massive rope range for skinny 8. 9mm redpoint ropes and fatty 11. 0mm projecting ropes. Edelrid designed this device to assist your dynamic catches by slightly braking the rope to a slow stop. This helps beginning belayers learn how to give an ideal catch, and seasoned climbers can always appreciate a little more assistance.