Open G "GDG" is the most popular tuning for 3-string cigar box guitars, and for good reason. It's just so easy to bang out good ole gritty blues using this classic tuning. Sometimes known as the G Modal or G Power Chord tuning, if you are looking for a great tuning to try on your CBG, this is probably it! ------------------------------------ Open G GDG String Set Varieties - Low G, Middle D, Middle G (SKU# 34-014-01): This set is the lowest of the low. All wound strings, .042", .030" and .022" phosphor bronze wound. Choose this option if you want a deep, low, growly blues tone. Low G, Middle D, High G (SKU# 34-015-01): OUR MOST POPULAR SET! This set is very similar to the first one above, but it swaps out the middle G for a high unwound G string. Having that high note really works well in this set, and allows for a stronger melody line. We recommend this set! String sizes are .042" wound, .030" wound and .009" plain steel. Low G, High D, High G (SKU# 34-016-01): This set keeps the low G but moves both the D and G up into the higher register. This is our second favorite set after the one above - it keeps a nice low thumpy bass note, balanced with the higher treble sounds of the high D and G. String sizes are .042" wound, .012" plain steel and .009" plain steel. Middle G, High D, High G (SKU# 34-017-01): This set brings the low G up to a middle G - still a wound string, but a full octave higher. This is definitely a treble-heavy set, with a lot more high-end twang - which can be very cool, if that is the sound you are looking for! String sizes are .022" wound, .012" plain steel and .009" plain steel.