Rapid spool replacement system for Shimano reels, online at www.abbocca.it.
Weighs up to 60gr less than the original. Three seconds to change the outer coil which is composed of a central body where there is the drag and clicker, and three outer rings interchangeable with three different capacities. Calculated to contain 250 meters of 0.35, 0.25, or 250 meters. 0.18.