This is six feet of beautiful, high-quality German-made 18% nickel-silver fret wire, in handy 12-inch lengths. Designated as "Medium/Medium" due to its mid-range crown width and height, this is the most popular size of fretwire used of modern guitars. It has a very slight radius (arc), which can be adjusted as necessary to match your instrument. This fret wire can be used to repair/replace frets on an existing guitar, or for new instrument building. The dimensions are as follows: Crown Width: .080 in (2.03mm); Crown Height: .043 in. (1.09mm); Tang Depth .050 in. (1.25mm). Recommended Slot Width: .023 in.