Shimano Deore XT RD-M786 10-speed rear derailleur. It features Shadow Plus clutch technology, which reduces chain slap and prevents chain drops on rough terrain. The derailleur has a narrow profile, reducing the risk of snagging on trail obstacles. It is a 10-speed component designed for mountain bikes, gravel bikes, and e-bikes. The construction is stiffer and more machined, which increases durability and improves shift quality. The model shown appears to be the black color variant with a GS (medium) or SGS (long) cage option.