The D10, Prelude, and Apprentice have 2½ octaves of range; the lowest note is the G below middle C. There are 12 courses of strings on the treble bridge and 11 courses on the bass bridge. This configuration is often referred to as "12/11". Easily available keys are G, D, C, and A, along with their relative minors. There are a variety of chromatic notes available in each key.
Superscript numbers indicate octaves (C4 is Middle C).
Dots indicate marked courses.
All strings are plain steel with loop ends.
Wire gauges are shown in inches.
Downloadable string/tuning chart
Downloadable string order form