I own a fair share of guitars - as far as acoustic guitars go, I favor my Schecter 12-string and La Patrie classical and, as a result, my old 6-string Yamaha acoustic that I have owned for 10+years would sit idly for much of the time. I was trying to think of different ways to spruce up its less-than-exciting sound... So I tried these high tuned Martin strings and it was exactly what the doctor ordered. My old, not-so-flashy Yamaha workhorse acoustic sings like it never has before and now I have a unique sound to pull out from time to time! They sound great and, although I was a bit shocked to see how thin the 3rd string is, they have held up great strength-wise as well.