Petzl Axess Sling 25 cm. The STRING helps stabilize the carabiner when clipping and protect the carabiner attachment loop from wear. It is available in three lengths (12 17 and 25 cm) to adapt to different uses and better manage rope drag. Specifications for Petzl Axess Sling: Manufacturer: Petzl Fabric/Material: Polyester Rubber Breaking Strength: 22 kN Features of Petzl Axess Sling Durable construction for intensive use Rope end of the quickdraw is equipped with a STRING to stabilize the carabiner when clipping and help protect the carabiner attachment loop from wear Package Contents: Petzl Axess Sling Petzl C041BA02: Axess Sling 25 cm