Black Diamond Dynex Runner-10mmx030cm - Black Diamond Dynex Runner - Keep rope drag and rack weight to a minimum with 10 mm Dynex Runners from Black Diamond. Dynex runners weigh less than nylon and have less bulk, saving weight and leaving more space on your rack. The tight weave increases durability. Dynex Runners also absorb less water than nylon and don't freeze, improving alpine and ice climbing. Almost every climb involves runners, so save weight and space with Black Diamond Dynex Runners.