This is a set of 4 strings voiced specifically for a 4-string cigar box guitar (CBG) that can be tuned in several different ways. They can be tuned in "Open G" for slide playing (D G B D), in "Open D" for slide playing (D F# A D), or in "standard guitar" tuning for fretted playing (D G B E). The standard guitar tuning is great for a fretted instrument - you can play the "small string" portion of most guitar chords with just a couple of fingers! These are extra light-gauge strings, meant for builds that have un-reinforced necks or that arent going to be played as heavily. #1 - .030" Bronze Wound #2 - .022" Bronze Wound #3 - .014" Plain Steel #4 - .010" Plain Steel For best results with reaching the desired tuning, these should be used on a CBG that has a scale length (the length from the nut to the bridge) in the 24-26" range. Much longer or shorter than that and the strings will either be too loose and sloppy, or so tight that they break before they reach the pitch. This string set is formulated based on our own experimentation and what has worked on our own guitars. If you want to hand-pick specific strings in specific sizes, this may not be the pack for you. But if you are not sure exactly what you need and want a set of inexpensive strings that should work just fine for your build, this is the ticket.