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 15% 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.