Wide range 9 speed single-shift group for use with e-bikesIncludes cassette, rear derailleur, shifter and chainE-bike optimized 12-50t ultra-wide ratio cassette with consistent progressionSingle Shift Per Swing for E-Bike Safe ShiftingDerailleur features Box`s Tri-Pack Limited Slip ClutchGlass fiber / nylon composite, steel and aluminum constructionMatte black finishBlackUPC/EAN/GTIN: 639266097303