What it means.
The .025 string means it 25 thousandths thick.
The 2,3,4,5,6 that the location the string goes. 1 being the thinnest ( bottom) 6 the thickest (top).
Which ones I would use? 2,3,4 or 3,4,5. Depending on the sound I was looking for.
2,3,4 for a higher tone, 3,4,5 for a lower.
There are many possibilities for stringing and tuning a CBG. A very common tuning is GDg. Use the A , D, G strings. This would be strings 5, 4, 3. The thicker wound strings, but not string 6, the thickest low E. The A is tuned down to G.
Without changing strings, you can retune to ADf# which is Open D tuning. Currently, I have a series of free lessons on my page teaching a method of moveable chords that makes it possible to play and strum the CBG like a standard guitar.
If you are interested in lessons for the GDg tuning, please check out my instructional video CD 4 that is for sale here:
Please feel free to write if you have any questions. Enjoy your new build, Keni Lee