Completely redesigned by Shimano engineers to be the most advanced Metanium ever produced, the Metanium features a never before seen Magnesium CoreSolid Body to provide both professional and enthusiast anglers with the solid advantage of durability, rigidity and sensitivity while reducing weight. The new CI4 Star Drag reduces weight even further. The Metanium features an MGL Spool IIl to reducing spool inertia up to 17% over the previous generation while still utilizing SVS Infinity Braking for the ultimate in adjustability and distance for all ranges of lures. The Metanium now comes with a brass MicroModule main gear for enhanced durability and long-term smoothness. SilentTune reduces spool bearing vibration to maximize casting distance and improve cast feel.