This is a guitar string rust remover specially produced for the maintenance of guitar strings. It is made of safe ointment. It is multifunctional, it can not only remove rust, but also oil the guitar strings, which is very practical. Features -Color: Black -Material: Oil -Size: About 6.30X2.50X2.50cm/2.48X0.98X0.98inch -The multi-functional design can not only effectively remove the rust on the guitar strings, but also help the guitar strings to oil. It is a very practical product. -Its oil will not be harmful to your health, and it can also help the guitar strings become smoother to prevent rust. -It is easy to put it in your guitar bag and carry it with you, because it is so small that it can be stored anywhere. -Its use method is also very simple, only need to wipe on the guitar string, can achieve the purpose of rust removal and maintenance at the same time. -Its , , good service quality and are your . Package list: 1 x guitar string rust removal pen