Novel design of lubricating oil smearing design  Double headed design, two kinds of functions, not only can derusting for strings, and can add lubricating oil for strings. the grey end is for cleaning, and the white end is for lubrication.  The anti-rust head is designed to remove the rust stain on your guitar strings, so that you can use your guitar string longer.  The material of this guitar string cleaner is safe, eco-friendly and non toxic for your use.  When you Press the guitar string, you feel a little uncomfortable. So you use the rust remove pen to avoid it rusting and to add the comfort factor on your finger tips.    Colour:Random colors (specified colors are not accepted)  Material:plastic  Size:12.8x3.5x2cm    Package Contents:  1 * Guitar String Cleaner    Only the above package content, other products are not included.  Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.