Shimano RD-M360 Acera 7/8 Spd Rear Mech filter_8-Speed Dynamic Chain Engagement (DCE) is

Dynamic Chain Engagement (DCE) is used to hold the chain and help prevent chain jump out

this cleaning colossus has 360 degree bristles to clean

and through stream crossings

Nylon composite body

Shimano RD-M360 Acera 7/8 Spd Rear Mech filter_8-Speed Dynamic Chain Engagement (DCE) isShimano RD M360 Acera 7 8 Spd Rear Mech Acera mountain bike rear derailleur with light action operation and over size pulleys for a wide gear choice. Features: Oversize 13 tooth tension and guide pulleys to reduce noise and wear Extension spring and low friction fluorine coated link pivot bushing result in a light shifting action Top normal spring for use with Rapidfire shifters IG and HG chain, 7 and 8 speed compatible For use with 28 to 34 tooth low