Here's what other sites are saying:
C.A.M.P. Big Wall & Protection Dryad Pro Small Double Pulley 2157. A.M.P.'s 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.
Features of the Camp USA Dryad Pro Double Pulley Compact double pulley Sealed ball bearings for High efficiency (92%) Aluminum alloy body and sheaves Stainless steel axle Prusik-minding
The CAMP USA Dryad Pro Small Double Mobile Pulley is a high-efficiency pulley for big wall hauling systems and emergency rescue scenarios. Relatively compact and lightweight, this pulley easily attaches to your harness and accommodates ropes up to 13mm. Sealed ball bearings provide high efficiency hauling (92%) and intensive use at higher speeds. Its aluminum alloy body and stainless steel axle stand up to rigorous use on climbs and rescue missions alike. This pulley is prusik-minding for easier rigging of hauling systems on routes or managing rescue situations. Plus, it features a large connection point for attaching two carabiners, as well as rotating side panels.
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