There's actually only a few string manufacturers, who make their own label strings, then everyone else's with their name on it. Ernie Ball's have always been outsourced, for instance. Alembic's are. Not uncommon at all. The catch is, usually the made-under-contract strings fall into two categories: Somebody wants something special (like Alembic, with those oval'd outer wraps) that are really nice, or something built to a price. Built to a price usually means they won't be like that maker's own label strings, which could be OK or better, or they're just cheaper, to give the reps something else to make money on.
I've tried everything in my time from Black Diamonds to Thomastik, and three weeks from now, they all lose it and sound the same to me. I'm living proof of the Ancient Maxim: Take Good Care of Your Strings, and They'll Go Dead Anyway ! Sheesh . . . . .
J o e y