Built tough for larger saltwater species, the Thunnus CI4 range fields four sizes from 4000 to 12000, which covers every inshore and light-medium offshore application imaginable. After freespooling a bait down the water column to where the target species lurks, the Baitrunner function is engaged. The spool begins to spin as a fish is fooled into taking your offering under near zero tension; you turn the handle, engage the main drag system hooked up!