This is a set of 4 strings voiced specifically for an electric 4-string cigar box guitar (CBG) that you want to tune in an "Open G" (D G B D), "Open D" (D F# A D) or "standard guitar" (DGBE - the four highest-pitch strings of a standard 6-string guitar) tuning. Open G and Open D are great setups for slide (fretless) playing, and the standard guitar tuning is great for a fretted instrument - you can play the "top" portion of most guitar chords with just a couple of fingers! These are good light-gauge strings that won't put too much tension stress on your CBG neck. #1 - .026" Nickel Wound #2 - .018" Nickel Wound #3 - .013" 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.