With self-adhesive sandpaper strip on four sides(400, 600, 1000, 1200 grit) to meet different polishing needs. The straight sides have high frets leveling performance. The main body is constructed of premium aluminum alloy material, anti-rust, very solid and sturdy. Suitable for the fret leveling of electric guitar, acoustic guitar, electric bass, etc. Great accessory for most guitarists, bass players, luthiers. Specification: Material: Aluminum Alloy, Sandpaper Size Chart: Size: 15x5x3cm / 5.9x1.96x1.18inch Package Includes: 1 Piece Guitar Fret Leveling Beam 4 Pieces Sandpaper Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.