Low B quality is really poor. The diameter is completely uneven all along the string, and the notes are not clear to be heard properly. passing fron the A string to E and then to B it’s a huge change in tone, from coear and focused A to E which is good but at the limit, to the B which is like entering in a different dark world where notes can’t be heard anymore. D‘Addario EXL 170-5 are much better. I also tried the Pure Blues 125-45 scale and the B string sounded a bit better, but still low-fi. I am a huge fan of the 4 string set for my passive P and PJ instruments, but this B string is not good to me.