Description Are you still looking for a professional and trustworthy maintenance tool for your guitar? Do you hope it can handle multiple jobs at the same time? Then don't hesitate to buy our professional guitar string oil pen directly, which can be applied to most string musical instruments and is one of your best choices. Features -Color: Black -Material: Oil -Size: About6.30X2.50X2.50cm/ 2.48X0.98X0.98inch -Prevent the string rust, easily remove dirt and rust to clean the string, increase the smoothness of the string. -Improve the feel of the string and make the string smooth. -Effectively remove the rust on the surface of the string and prolong the service life of the string. -Increase the string smoothness, improve the touch feeling of the string, so that the string is smooth. -The daub head contains oil inside, so it will not come out to the fingerboard when it is smeared. Package List1 x guitar string rust removal pen