Perfect for cleaning hard to reach places. Made of Microfiber it works by attracting removing and holding grime. The Microfiber rope is highly tear-resistant and it is washable.Includes twenty ropes each 20" longPerfect for cleaning rear cassette front chain rings derailleur pulley wheels hubs and spindles brake arms bottom bracket / crank interface and moreMicrofibers work by attracting removing and holding grime while other materials simply move it around. Microfiber captures dirt grease and particles inside its star-shaped grooves and removes grime better than other materials