The Camp Dryad Pro is a high efficiency compact double pulley designed for quick and easy haul systems. It uses the same design as the Dryad, but features sealed ball bearings for higher efficiency and intensive use at higher speeds. It has a large primary attachment hole that accommodates two carabiners and a lower becket hole for one carabiner. Prusik knots can be installed on either side aramid cord suggested making it particularly useful for crevasse rescue scenarios. For ropes up to 13 mm. Weight: 5.5 oz. 155g. CE and UIAA certified. Compact double pulley Sealed ball bearings for high efficiency 92% Aluminum alloy body and sheaves, stainless steel axle Prusik minding For ropes up to 13 mm Weight: 5.5 oz. 155g Inner sheave diameter: 1.1 28mm Working Load: 1.8kN x 4 7kN, 405 LBF x 4 1574 LBF Breaking Load: 26Kn, 5845 LBF CE and UIAA certified.