1、Nut and saddle are made of genuine bone, able to improve the sound quality of your guitar, and make it more playable. 2、Well-made pre-cut 6 string bone nut for acoustic guitar, electric guitar. 3、Needle files set comes in 13 different sizes from 0.14in to 0.61in. 4、Use the fine grit sandpapers(320/240 grits) and file to fit. 5、Minimal sanding is required to ensure a nice fit in the nut slot. Basic replacement tool kit to rebuild or repair the acoustic/classical, electric, and vintage guitar. Features: Nut and saddle are made of genuine bone, able to improve the sound quality of your guitar, and make it more playable. Well-made pre-cut 6 string bone nut for acoustic guitar, electric guitar. Needle files set comes in 13 different sizes from 0.14in to 0.61in. Use the fine grit sandpapers(320/240 grits) and file to fit. Minimal sanding is required to ensure a nice fit in the nut slot. Note: *Depending on your guitar to do some sanding and filing may required. Specifications: Material: Metal Nut Size: 4.3*0.6*0.9cm / 1.69*0.23*0.35in Saddle Size: 7.2*0.3*0.9cm / 2.83*0.11*0.35in File Size: 0.4mm-1.6mm / 0.14-0.61in Sandpaper Grit: 320 grits(3pcs), 240 grits(6pcs) Package Size: 12*8.2*1cm / 4.72*3.22*0.39in Package Weight: 40g / 1.41oz Packing List: 9 * Emery Paper 1 * Nut 1 * Saddle 1 * Nut File Set 9 * Emery Paper 1 * Nut 1 * Saddle 1 * Nut File Set