Shielded Stainless Steel Anti-Rust Bearings. These bearings have undergone a special heat treatment resulting in high metal strength. Shielded A-RB bearings use either a rubber shield or stainless steel shield (depending on bearing size) for the ultimate in corrosion resistance and contaminant protection against sand, salt or dust.

Hagane is a Shimano reel design concept created to withstand continual use and extreme abuse. Hagane is an innovation with built-in toughness and durability that works alongside Shimano's precision engineering.

The HAGANE Body is a metal reel body with high rigidity. The body rigidity and impact resistance virtually eliminates body flexing on the reel while fighting fish. The result transforms the angler's actions directly into cranking power, increasing efficiency through strength.

CI4 is a Shimano original material reinforced with carbon fiber that is lighter and has a higher strength than conventional resin material. CI4+ is an advanced version of the original CI4 material and is 2.5x more rigid than its predecessor. While improving lightness and rigidity, reel bodies and rotors built with CI4+ are further reduced in size and weight.

The MicroModule Gear technology creates a smooth retrieve by utilizing smaller teeth to increase the number of contact points between the drive gear and pinion gear.

X SHIP provides improved gear durability. By supporting the pinion gear on both ends with bearings, the pinion gear maintains precise alignment with the drive gear. This increased support allows the gears to stay in the same position under the heaviest loads. X-Ship technology also eliminates the friction between the spool shaft and gear to further benefit anglers with enhanced casting performance and casting distance of lighter lures.

The reverse tapered spool corrects the winding shape and reduces spool vibration. The spool balance after spooling has a significant impact on casting performance. The beginning of the line spooling is particularly important. The newly developed Magnum Light Spool IV features a reverse-tapered shape that is ultra-thin and designed for extremely low inertia. It winds the line evenly and consistently. A well-spooled, balanced spool reduces spool vibration during casting, resulting in improved performance.

By applying slight pressure to the bearing holding the spool, SilentTune reduces the vibration of the bearing during high-speed rotation. This improves the quietness while casting and the rise of the spool rotation becomes even smoother.