With years of development and testing already under their belt, the RPM has become an incredibly versatile modular system that works smoothly and efficiently. The revolutionary Pulley/Prusik-minding modular structure is a high strength, torsion-resistant building block suitable for rescue, rigging and hauling applications. The swivelling, shackle body accepts various cartridges to allow a multitude of configurations and a certified friction prusik cord interfacing with prusik-minding cheek plates does all of the holding work with minimal 'sit back'. The prusik can be installed at either end to give the option of top or bottom control.