Ernie Ball 2143 Earthwood Custom Phospor

Over the years I increased the gauge of the strings on my guitar. Thick strings give solidity to the playing, especially if you strum a lot, and a louder fuller sound. On the acoustic (gibson hummingbird 2013) I got to the point where 12 was to thin. Then I went to 13 but that was too thick. I kept 13 for a while and this feeling of being too stiff did not go away. So, that's it. 12.5 is the right gauge.