This titanium version of the Shimano 11s NW pulleys offers ultra-long service life thanks to the extreme durability of titanium and coated bearings. The precisely machined titanium narrow-wide symmetrical profile ensures stable chain retention, precise shifting, and high efficiency. The CeramicSpeed pulleys for Shimano 11s, 12-tooth are developed, designed, and hand-built in Denmark and come with separate dust covers to fit 9100, R8000, RX, GRX, XT, and XTR series derailleurs. In the box: Two 12-tooth pulleys UFO TECH Bearing Oil, 15ml bottle. Universal Bold pulley for UFO TECH bearings Decal