Model:RD-M610 Level:Deore Speed:10S Shadow system Origin:Made in Japan Shadow features a super low profile design that reduces the risk of damage from trail side hazards Direct Mount compatible Rear Derailleur system gives more space around the rear frame dropout resulting in easier rear wheel removal but also allows frame designers to shorten chain stays, increase axel sizes and move suspension pivotsSingle tension spring prevents contact with the chainstay resultingin a silent rideDirect cable routing prevents snagging from any trail side hazardsAlloy and steel construction leads to lower weight without compromising strength and durability