The SHIMANO Thunnus 8000 uses carbon materials which is excellent in high impact situations. Thunnus CI4 is a response to all the anglers out there in love with the ease of use and functionality that wanted the reel to shed some weight. Thunnus CI4 is up to 7oz. lighter than its predecessor without sacrificing any power. Quite the opposite!! Due to new drag systems for the main drag and the baitrunner drag Thunnus CI4 is the most efficient live bait spinning reel on the market with unmatched adjustability for fishing any bait in any condition as well as the smooth stopping power that this generation of Thunnus will be known for. Super lightweight CI4 frame and rotor Paladin gears, Populsion line management system SR one-piece bail wire Power Roller III Direct drive mechanism Oversized Septon grips Waterproof drag with Dartainium II cross carbon washers Six shielded A-RB ball bearings plus Super Stopper II For mono, fluorocarbon or braid