Check the listing for details. Shimano Deore CS-M6100 12 Speed 51T Hyperglide Micro Spline Cassette MTB. Color: Silver, Condition: New. Listed at 64.88 USD. NEW Shimano Deore CS-M6100 12 Speed 50T Hyperglide+ Cassette MTB With the Deore cassette CS-M6100, Shimano introduces the 12th sprocket for the inexpensive Deore beginner groupset. As with the top component series, the Hyperglide+ shifting aid construction ensures particularly smooth and quiet gear changes, even under load. The largest sprocket has 51 teeth, the smallest only 10, so this cassette is only compatible with Shimano Micro-Spline freehubs. Specifications: Application: All Mountain, Cross Country, Enduro Gearing: 12-speed Gradation: 10-51 Sprocket Material: steel Freehub Body Compatibility: Shimano Micro Spline ***These are OEM Shimano Parts, Brand new, Never Installed on Bike, Never used in any way, just NOT in retail packaging.***