Stringjoy DRP11 Signatures -Nickelwound 11-58 Drop C

These are the strings I most often recommend for Drop C, and they work well for lower tunings as well if you don't mind your strings being a tad slinky. If you've never played a set optimized for drop tunings, you don't know what you've been missing. Finally, you'll see what it's like to have balanced tension, even when you tune down.