Petzl's Ultralegere climbing pulley Wheel is the choice for mountaineers who may need to set up a pulley system, but don't want to take along any extra weight. It is best used with a locking oval carabiner such as the Petzl "OK". Carabiner is not included. Carry this for use in emergency only. It is not recommended for tyrolean traverses or for organized rescue. Working Strength: .8kN Breaking Load: 16kN Weight: 10g Note that this item of climbing safety equipment is non-returnable. Please call us toll free at 877-236-8428 or e-mail [email protected] with any questions.