Harken MKIV Furling Systems are strong, lightweight and aerodynamic, with the performance and features that Harken is known for. Longevity, ease of use and simplicity of installation are crucial components of it's design. These free-rolling furlers make a big difference in headsail control by allowing racers and cruisers to quickly furl and reef from the safety of the cockpit, while maintaining great sail shape and optimal speed.