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Holes for easily clipping carabiners, flexible enough for you to set your preferred zipline mode. Suitable for both indoor and outdoor activities. A system of two pulleys used together to move a load, which is in order to increase the mechanical advantage of the system, thereby reducing the effort required to move a given load. There are two types of tandem double speed pulley available to choose from NewDoar depending on the different material of pulley: stainless steel (25kN) and aluminum (28kN).







