Package Content: 1 x radius sanding block ( Size: 12#, Length: 5.12 Inch )Total Size: 5.12'" x 2.56" x 1.69" / 13 x 6.5 x 4.3cm (L x W x H).Application: Can be accurately displayed or changed the radius of the fingerboard. Acoustic guitars generally use 12# and electric guitars generally use 9.5#.Groove Design: The groove side design gives you a comfortable grip.How to Use: When working on the composite radius fingerboard, simply move along the neck to change the sanding block. Note: The data are all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail. Note: Please allow slight errors due to manual measurement. Please make sure you don't mind before bidding. Color may vary depending on your monitor, please understand. Note: Hello, please pay attention to your shipping address when purchasing products. If your delivery information (e.g. name, street, house number, doorbell/email without name, etc.) is incorrect, the order will not be delivered correctly