The Shimano Thunnus CI4+ Spinning Reel is a lightweight, high-performance spinning reel designed for saltwater fishing. It features a CI4+ body construction, which is a lightweight, corrosion-resistant material that is 20% lighter than traditional aluminum. The reel also features a Propulsion Line Management System, which helps to reduce line twist and improve casting distance. The reel has a maximum drag of 11 lbs, and a gear ratio of 5.2:1. It also has a cold-forged aluminum spool, and a Super Stopper II anti-reverse system for instant hook setting power. The reel is available in a size 4000, and is perfect for light to medium saltwater fishing.