Finish Line Gear Floss is an advanced cleaning & detailing tool The microfiber rope is perfect for cleaning cassettes & hard-to-reach bike parts, such as front chain rings, derailleur pulley wheels, hubs & spindles, brake arms, bottom bracket / crank interface, & more Unlike other materials that simply move the dirt & grime around, the microfiber technology of Gear Floss attracts & traps it inside its star-shaped grooves Gear Floss is highly tear-resistant & it is washable 20 Ropes per pack Each Rope is 20 in / 51cm