The Camp Sphinx Pro is a super compact, lightweight and easy handling pulley with fixed side plates. It uses the same design as the Sphinx, but features sealed ball bearings for higher efficiency. The Sphinx Pro is designed for intensive use at higher speeds, but is small and light enough to easily carry on your harness or throw in your pack for ski touring and mountaineering. Unlike other pulleys with fixed side plates, the Sphinx Pro allows a prusik knot to be installed on one side aramid cord suggested making it an ideal pulley for rigging a haul system on route or managing crevasse rescues. For ropes up to 13 mm. Weight: 3 oz. 85g. CE and UIAA certified. Fixed side plates Sealed ball bearings for high efficiency 92% Super compact, with aluminum alloy body and sheave and stainless steel axle Prusik minding For ropes up to 13 mm Weight: 3 oz. 85g Inner sheave diameter: 1.1 28mm Working Load: 3kN x 2 6kN, 675 LBF x 2 1350 LBF Breaking Load: 25Kn, 5620 LBF CE and UIAA certified.