Shimano DEORE 12S M6100 4pcs GroupSet Derailleur Chain Cassette Right Shifter 1. M6100 12S Right Shifter (I have with window or no window, and will ship it randomly. You can leave a buyer note if you have a preference ) SHIMANO's RAPIDFIRE PLUS DEORE shift lever delivers light and responsive shifting for improved control out on the trail. ?Quick and easy shifting 2. M6100 Cassette 51T (Micro Spline Hub Required) With its BEAM SPIDER construction, the new SHIMANO DEORE M6100 12-speed cassette shaves weight while increasing SHIMANO's MTB gearing range another gear. Using SHIMANO's new MICRO SPLINE freehub body and HYPERGLIDE+ tooth profile, the 10-51T cassette delivers advanced shifting performance. ?Trickle down technologies at its best 3. M6100 Rear Derailleur The all-new SHIMANO DEORE M6100 rear derailleurs deliver advanced shifting performance with decreased tension in the low gear position. Larger 13T pulleys increase efficiency and chain management while compatibility with SHIMANO's new 12-speed cassettes boosts range. ?1x12-speed SHIMANO SHADOW RD+ rear derailleur ?Fast and precise shifting for modern mountain biking ?Silent drivetrain in all gear positions 4. M6100 12S Chain The M6100 chain provides smooth shifting and enhanced chain retention thanks to an extended portion of the inner plate. The new chain features QUICK-LINK assembly and is optimized for HYPERGLIDE+ cassettes and DYNAMIC CHAIN ENGAGEMENT+ chainrings. ?Proprietary design ensures smooth shifting and strength ***These are OEM Shimano Parts, Brand new, Never Installed on Bike, Never used in any way, just NOT in retail packaging.***