The Protraxion is a swing-sided self-jamming pulley designed for hauling systems. The coefficient of friction is very low thanks to a 38 mm diameter sheave mounted on sealed ball bearings. Its performance makes it an ideal pulley for big-wall climbing. An auxiliary return point for the rope allows hauling systems for heavy loads to be set up. The rope is installed very easily by opening one of the swing sides, which is unlocked by simply pressing a button: you can thus install the rope when the Protraxion is already installed on the anchor point.