Fits to Daiwa 08Zillion, 09Zillion PE special and etc with Magforce Z brake system. This is the strong rotor spring employed to 09Zillion HLC hyper long cast reel spools. It is 4 times stronger than stock 08Zillion spools. With this HLC spring, spool will spin at twice the speed as stock spools at maximum, to cast 80-100yds with 1/2-1oz rigs.