This is the replacement gear set for Shimano 07Metanium MG, 07Core100/101MG, 08Metanium MGDC, 08Chronarch 100D/101D reels. 8.0:1 super high ratio. Comes with drive gear, pinion, and a carbon washer. Drive gear is made of brass and it will last much longer than stock duralumin drive gears. Please replace the washer just under the drive gear to the thin carbon washer included to the kit, to lower the gear height.