The harken reflex furling system is a game changer the previous generation of free-flying sail furlers often resulted in partial or uneven furling Patent-pending harken reflex furlers provide sailors confidence that their code zero sails will furl with speed and control sailors use downwind sails more often, even when sailing shorthanded. Pact drive unit is easier to handle than other designs Pull the furling line and the drive unit reacts reflexively to rotate the torsion cable, immediately transferring torque to the head swivel without unwanted corkscrewing delaying the response. The head swivel reacts instantly, spinning the sail smoothlypletely from top to bottom for an even roll-up and super-tight wrap The head swivel reacts instantly, spinning the sail smoothlypletely from top to bottom for an even roll-up and super-tight wrap