Sturdy material: The fret rocker and notched straight edge are made of stainless steel, providing durability for long-term use and helping protect your guitars from scratches. 9-piece understring radius gauge: Made of stainless steel, this set includes 7.25 inch, 9.5 inch, 10 inch, 12 inch, 14 inch, 15 inch, 16 inch, 17 inch, and 20 inch radius gauges. Ideal luthier tools for guitar and bass setup. Usage: These guitar luthier tools are great for guitar technicians and players who want to maintain and repair their instruments efficiently. Helps reduce string buzzing. Suitable for electric guitars, acoustic guitars, bass guitars, banjos, and other stringed instruments. Color: Silver Material: Metal Package Contents: 1 x Notched ruler 1 x Space ruler 1 x Triple-cornered ruler 9 x Understring radius gauge Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.