Shimano derailleur cable housings aid in smoother shifts for better derailleur performance. Smooth shifting action of the rear derailleur thanks to its superior construction and materials 4mm diameter shift outer casing for rear derailleur Compatible with Dura-Ace 9100 Coil outer type Entirely greased Pack of 10 Item Specifications Color Black Defined Color Black Housing Diameter 4 Housing Length 240 Shimano Derailleur Housing UPC: 192790326412