The Martin & Co 80/20 Bronze Acoustic Strings are a pretty standard set of guitar strings for of course, your acoustic guitar. I've gone through a few packs of these strings for my Martin DX1-R, although they aren't currently on them now. The strings come in a few different gauges, ranging from .10 - .13, but I usually use the light .12's. This is really just a matter of personal preference when it comes to both sound and feel, although the difference between light and extra light isn't going to be drastic. I'm not incredibly picky when it comes to my strings, but to me these are as good as any for my Martin. I don't always get strings of the same brand for guitars, as Martin strings are great in general and can be used on any brand of acoustic guitar. Martin is one of the finest makers of acoustic guitars in the world, so naturally they make pretty high quality strings as well. They do make strings of all shapes and sizes, so I'd encourage those looking for the perfect set of strings for themselves to give a bunch of strings a try to see what works for me. Definitely keep the Martin & Co 80/20 Bronze Acoustic Strings on the list to check out, as these are tried and true strings that may not have anything fancy about them, but they get the job done and will last you a pretty long time. It all depends on how much you play, but even if you play often you shouldn't have to change your strings more than every two months with these, unless of course you're playing and recording every day. No matter what you're use is going to be for the Martin & Co 80/20 Bronze Acoustic Strings, they're definitely a set worth trying out if you're looking for new acoustic strings.