The devil is always in the details, and sweating the details has been a family tradition at D'Addario for nine generations. Just look at something as simple as D'Addario's plain steel guitar strings. The ball ends are precision turned from solid brass stock. The edges have radii that prevent the ball end from cutting into wooden bridges or guitar tops. Each string is twisted to perfection right down to the three neatly wrapped "lock twists." And those lock twists help keep plain steel strings from unraveling or breaking prematurely. Each and every spool of precision drawn high carbon steel wire they use goes through three quality control tests before it hits the inventory shelves. Therefore ee guarantee you'll be happy with D'Addario strings. Also known as "The Player's Choice".