2. ALUMINUM ALLOY: The climb swing pulley made of high strength aluminum alloy, light weight, easy to carry, of 20KN, safe to use. 3. APPLICABLE SCENARIOS: This pulley is perfect for various activities such as rock climbing, mountaineering, cave exploration and rescue due to its compactness and durability. 1. SMOOTH PULLEY: polishing treatment concave pulley, using ball bearings, rolling smoothly, not appear friction blocking situation. 4. : Our pulley is perfect for climbers who need to walk for long and steep distances due to their minimal frame construction and rollers.