Hey! I am using a great set of Labella Flat Wound Short Scale Strings on my Fender MusicMaster. Stupidly, I lost the packaging on the strings and I don't know what gauge they are. I want to put a new set on. Is there any way to tell what gauge they are w/ the naked eye? Does LaBella distinguish the gauge by a making on the ball or the color coat @ the headstock area of the string? Also, how often should i be changing Flatwounds? My band plays 3-4 a week. Thanks!