Petzl - ANNEAU, Polyester Sling Polyester 1" high 4" wide DURABLE WEBBING: The AXESS sling is a simple, durable solution for beginner and casual climbers looking for reliability. STRONG: This sling has a strength of 22 kN. LIGHTWEIGHT: The AXESS 12 cm sling weighs only 16 grams and the 17 cm sling weighs only 22 grams. STAYS IN PLACE: The STRING S holds the rope end carabiner in place and helps protect the webbing from abrasion. OPTIONS: Choose between 12 and 17 cm lengths.