Shimano 4700 10 Speed Rear Derailleur, offering pro-level features.   Features: Wide link design increases rigidity and service life. Advanced light action for low-friction shifting up or down the block. Alloy body's and outer link leads to lower weight without compromising strength and durability. 11-tooth pulleys for reduced pulley wear and chain noise. Two fluorine-coated link pin bushings for low-friction performance. 32 tooth max with triple, 34 tooth max with double chainset. For use with 4700 shifters only.