The use of CI4 delivers a substantial weight saving on the compact Ultegra reel body, making rod speed easier to generate when distance casting. To further increase casting performance, the Ultegra CI4 uses Super Slow Oscillation line lay and Shimano's Propulsion Line Management System fitted with a Hi-Speed Drag for increased casting performance and simple, ultra-fast drag adjustment. HAGANE Gear and X-Ship produce powerful winding performance and S A-RB bearings combined with a Shimano roller bearing deliver supreme smoothness.