[EFFICIENT&DURABLE]: fret erasers are made of natural rubber and emery by a foaming process. The hardness of emery is that of corundum, so the fret polishing is more efficient and more durable. [MULTIPURPOSE]: fret polish eraser can solve problems such as fret file scratches, corrosion/oxidation/rust of frets&string. And it is suitable for the character line polishing of most musical instruments, such as guitar, bass, ukulele, etc. [SOFT&ELASTIC]: The polishing rubber can effectively fit the filaments and , reducing damage to the filaments and . It can be cut into different shapes to facilitate grinding and polishing of different metal parts. [MULTI-VALUED]: are a 100&400&1000&1500&2000 Grits. The larger grit number, the finer and brighter effect it will be. For more serious rust or oxidation, you can a smaller particle size, and . [ DESIGN]: Good size to adapt to finger force. Clear numerical marks facilitate identification. A of color matching and exquisite packaging. KEEP IT FROM KIDS. Because it looks like a candy.rtable to grip. Material: Rubber + Emery colour: multicolor Package contents: 5 x Guitar Fret Erasers(2000 /1500 /1000 /400 /180 ) 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.