Most affordable fully featured 1x rear derailleur in the industry X-Horizon design reduces shift force, ghost shifting, and chain slap 12 tooth X-Sync pulley wheels for reliable, long life performance Fully compatible with all SRAM 1x drivetrains NX 11sp 42 Long 1to1 BLK 322g 1xUPC/EAN/GTIN: 710845783074