The Shimano Sustain FK Spinning Reel delivers premium performance with improved winding power, durability, and casting performance for serious anglers. Advanced rotor design, revolutionary gear and drag technologies, and refined internal engineering combine to create a versatile reel that excels in both freshwater and saltwater applications. The asymmetrical Magnumlite (MGL) Rotor enables reduced startup inertia for precision lure control while reducing the overall weight of the reel. This advanced rotor design improves balance and responsiveness, making it easier to feel every vibration and detect the lightest bites. The CI4+ construction further reduces weight without sacrificing strength, while the G-Free Body design shifts the center of gravity closer to the rod for reduced fatigue during long fishing sessions. InfinityXross technology improves gear durability by spreading the gear load across a wider surface area to diminish stress points and significantly extend gear life. Combined with MicroModule II technology that creates smoother engagement through smaller, more precise gear teeth, the Sustain FK delivers an incredibly refined retrieve. InfinityDrive gives the reel improved winding power for handling heavy loads, reducing rotational torque and decreasing frictional resistance when cranking against big fish or heavy current. Engineered with InfinityLoop technology that delivers super-slow oscillation for ultra-precise line lay, the Sustain FK reduces friction while casting or pulling drag. This precise line management is further enhanced by the Anti-Twist Fin that maintains tension to eliminate line sagging, improve casting distance, and reduce wind knots. The DuraCross drag system uses a uniquely woven washer to provide smooth and durable performance across a wide range of fishing applications. Protected by a Hagane Body that provides rigidity and eliminates flex, and powered by Hagane Gears that deliver long-lasting smoothness and durability, the Sustain