The Furlex 20S bottom furlers has twin bearing units with 4 mm stainless steel ball bearings. These larger ball bearings run in multi-axis bearing units to reduce friction and wear. A further benefit of the bearing design is that with one bearing in the upper part of the furling drum and one in the lower, the radial torque from the furling line is evenly distributed. This eliminates the problem of the drum twisting, a common cause of friction in more basic designs.