Specifications: Made of stainless steel, durable enough. Etched with radius on handle. easy to measure the radius from either above or below the strings. Accurately setup your guitar bridge saddles to match the fingerboard radius. Item Name: Understring Radius Gauge Quantity: 9Pcs/Set Material: Stainless Steel Radius: 7.25, 9.5, 10, 12, 14, 15, 16, 17, 20 Size: 6.6cm x 7cm x 0.1cm/2.60" x 2.76" x 0.04" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 9 x Understring Radius Gauge