If you are looking for a practical and multipurpose string derusting care pen, you should take at this item. It is made of , which enjoys strong durability. It can greatly meet your practical requirement, and can be used for stringed instruments such as guitars and violin. Features - Color: Black. - Material: Rubber, emery. - Size: About 13.20X3.30X2.00cm/5.19X1.30X0.79inch. - It is a string rust removal care tool for some stringed instruments, and simple and convenient to use. - The surface is smooth, the hand feels comfortable, and it is simple and easy to use. - Will not cause damage to the strings, and can extend the life of the strings. - It is very small and portable, easy to carry with you, also convenient to store, durable and practical. - High durability and not easy to deform. Fine workmanship and good texture ensure practicality. Package list: 1 x Strings Derusting Care Pen