complete top-of-the-range brake cable set designed to suit Dura-Ace 9000 brakes fitting new brakes or completely overhauling your brake cabling Couldn't be easier - Everything you need in one pack includes 1.6 mm polymer coated inner wires (1 x 2000 mm, 1 x 1000 mm), and SLR outer casing for a complete bike (1 x 1800 mm, 1 x 800mm) 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 braking operation outer casing is lubricated Internally along its length with low-friction silicone grease to reduce cable friction slr casing uses a special spiral wound construction that is axially stiff yet Can Be bent around handlebar curves the outer casing is lined with a hard polymer sheath to keep Its round shape to assist with the smooth operation of the inner wire.