In creating the Sustain FI, Shimano has engineered a spinning reel that offers the perfect balance between rigidity and sensitivity. By leveraging the benefits of the Aluminum Hagane Body, the Sustain FI possesses the rigidity of a metal outer shell that maximizes impact resistance whilst eliminating body flex under load. To provide enhanced sensitivity, a Magnumlite Rotor has been fitted and offers an effortless low inertia rotation – a significant improvement on the previous Sustain FG model. X Protect technology provides the Sustain FI with Shimano’s highest degree of waterproofing protection. Such technology leverages both a water repellent treatment and labyrinth structure that blocks any saltwater entry into the reel’s internals. The cold forged Hagane Gear and X-Ship provide a gearing system that is smoother and stronger than any other on the market. This gives the reel a much smoother gear transition but also unrivalled pulling power. With four sizes available in the range featuring 8+1 Shielded A-RB bearings and drag output that ranges from 9kg to 11kg depending on the model.