I've got nothing to do with Santa Cruz, this isn't a stealth ad. I just tried their new Santa Cruz Parabolic tension strings for acoustic guitar and I want to tell all of you about how terrific they are. They don't have string gauge, just medium and light tension. I got a set of medium tension for a Martin dread I have and they are quite different from anything else I've tried in years. I do think Martin Retro strings are different and good too but these are something else. They are pricey, $18 a set. They have full tone and yet a sort of spongy tension, I can actually bend the strings which is unusual for me on a Martin acoustic. The Medium tension strings seem like light gauge but not exactly. I find it hard to describe these but I noticed a really nice difference right away when playing them. This of you who play a lot of acoustic guitar may find it worth trying these if you don't mind the high cost. Nice to really have some different strings from the usual Phos/Bronze sets that are everywhere on every guitar. The Phos/Bronze sets last about two weeks and are too bright anyway for my taste. Maybe someone who has tried these and is a bit more articulate can describe them better.