Petzl - EXPRESS, Sling for Climbing Quickdraws 1" high 4" wide Variable width webbing makes for easy handling and clipping. Included STRING holds the rope-end carabiner in place and helps protect against abrasion. Strength: 22 kN. 17 cm length is great for reducing rope drag on long or traversing routes. Also available in 11 cm and 25 cm lengths.