After testing dozens of different grip patterns (ribs, nobs, etc.), Olaf Harken said at the Annapolis unveiling, Harken engineers determined a diagonal, radial rib pattern worked best. The pattern is described as working like a screw, "driving the wraps down when easing [the sheet] to keep them on the part of the drum where you have the best control." As you ease a jib sheet, for example, the angle of the ribs stops the sheet from working to the top of the drum, thereby preventing overrides and allowing for a smooth, controlled release as the line exits the winch. This means smoother, quieter sheet easing, and, on distance races, more restful sleep for the off-watch crew.