Designed to handle all of fret maintenance from rough grinding to fine polishing. Material: These fret polishing blocks are made of high-quality grinding stones and are . They are perfect for repeated use, ensuring your guitar maintains its best playability and appearance. Versatile grinding tool: The teal polishing block has a coarser grain, perfect for initial rough grinding. Extremely versatile, it can be used not only to sand and polish guitar frets, but also bridges, nuts and saddles. EASY TO USE: These fret polishing tools are easy to use and suitable for professionals and amateurs. They are essential to maintaining the quality and playability of string instruments. Colour:As Shown Material:grindstone Package Contents: 15 * Polishing Stone Only the above package content, other products are not included. Note: Light reflection 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.