1. Two-Way fingerboard sanding block for the sanding frets and leveling fingerboards. There are two different radiuses on each block. 2. design, each sanding block can math 2 radius. 3. Material: maple. High glossiness, durable and long-lasting use, not easy to deform. Groove side design gives you comfortable grip. 4. Note: Sandpaper included(600 grit). Different guitars need different arc grinding blocks, please confirm the size of your Guitar or Bass before you purchase. Dimensions: 150mm x 75mm x 35mm (5.9 x 2.95 x 1.38 inches) paper (600 grit): 146mm x 65mm(5.75 x 2.56 inches) Sanding Block Weight: 328g/11.57oz 2 fret board radius used in guitar & bass building and repair: 10 inch - 12 inch Material: wooden colour: Wood color Package Contents: 1 x Sanding Block 2 x Sandpaper(600 grit) Only the above package content, other products are not included. Note: Light 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.