complete top-of-the-range gear cable set designed to suit Dura-Ace R9100 gears fitting new gears or completely overhauling your gear cabling Couldn't be easier - Everything you need in one pack includes 1.2 mm polymer coated inner wires (1 x 2100 mm, 1 x 1800 mm), ot-rs900 outer casing (1 x 240 mm) and ot-sp41 outer casing (1 x 1700 mm), and all end caps polymer coated stainless steel inner wire leaves a smooth surface for low friction and reduced sliding resistance providing a lighter quicker shifting operation outer casing is lubricated Internally along its length with low-friction silicone grease to reduce cable friction ot-rs900 outer casing has added compliance to allow for new road shadow much design requirements sp 41 outer casing uses a special directional wound construction process makes for an axially stiff cable that transmits shifting movements accurately and quickly outer casing is lined with a polymer sheath to assist with the smooth operation of the inner wire.