The Petzl Micro Traxion Pulley is a progress capture pulley for crevasse rescue, hauling, self-rescue and emergency ascender. Versatile and ready for the unexpected, it's ultra-light and ultra-compact for easy carry. Usable on 8-11mm diameter ropes and even works when said ropes Are frozen or muddy. Lock the cam and it can also be used as a simple pulley. Final SALE: For safety reasons, we cannot accept returns on load-bearing Climbing equipment. Sorry for being so mean. Features of the Petzl Micro Traxion Pulley Pulley with integrated progress capture device can be used as a progress capture pulley or simple pulley Upper button allows cam to be locked in open position Aluminum sheave mounted on sealed ball bearings for excellent efficiency Rope clamp works on muddy or frozen ropes Ultra-compact and lightweight