Daiwa's all new Saltist Spinning Reels have taken a huge step forward from their predecessor! These all aluminum reels have been rebuilt from the ground up and have been outfitted with Magsealed technology. The main shaft and line roller are both mag sealed. Daiwa has also put a mag sealed ball bearing into the 4500 and larger size reels along with seven CRBB corrosion resistant ball bearings. The 4000 and smaller sizes have 8 CRBB.