This is the brake tuning kit to make Mag-Z Boost reels into HLC, Hyper Long Casting. Brake rotor is 0.8mm shorter than stock rotor, with about 4 times harder springs, to emit less brake to add distance. Kit includes purple brake rotor and 2 springs. Please replace these of your reel spools. Fits to Daiwa 22 Zillion TW HD, 23 Steez A2 TW reels. You will surely need bent tweezers to swap these parts, when you set C clip back.