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