It is interesting that different brands are really inconsistant. I have miked up a few brands and for example Ernie Ball 10's actually mike at slightly heavier than a 9. So I have elected to use D'Adarrio 11's (11 thru 49). They are really 11 also. I use these on ALL my electrics. Acoustics I use D'Adarrio J 17's (13 thru 56). I have been using these for several years now and see no reason to change. I don't break strings very often so they hold up well also.