Compatible with our Carbon SS and Carbon Synergy Climbing Sticks. Our single step aiders are constructed of Ultra-High Molecular Weight Polyethylene (UHMWPE) rope, are metal free, have a 2500lb breaking strength, make zero noise and weigh only 1oz. They are specifically designed to work with our climbing sticks using a simple and silent attachment cinch, enabling you to effectively double the height you can achieve with each climbing stick.