Bought a used soprano a couple of months back. It had Worth Brown strings. The E string knot pulled through the other day and was to short to re-tie. Put a set of Aquila 4u's on and hate them, sooooo I'm trying to figure which Worth strings to buy. I remember the old Worth A string was really thin and I could bend it fairly easy. I didn't care for that much. I have the Aquila 4U thickness measurements and have been comparing them to the Worth. Seems the BM MAY be what I want, but the A string seems a little thin. Anybody have experience with the Worth BS series. Sorry for the rant. Thanks.