This clarinet swab by The Original Swab company is a 100% cotton cloth with a rubber coated weight on the end. It is simply dropped into the barrel of the clarinet and pulled gently through. It will help clean the walls of the horn and remove moisture as well. This is a must for keeping your instrument in good playing condition. %100 Cotton (very absorbent) Rubber Coated Weight (no damage to horn) Sturdy pull cord Machine Washable Long Lasting Item Number: CS1