These Fender 860L Dura-Tone(R) Coated Acoustic phosphor bronze strings are wound on a special hex core wire for a brighter, more consistent, and long lasting tone. Fender Dura-Tone(R) strings are made with a specially applied micro-treatment that resists tone-killing grime and corrosion. These high quality strings will bring out the lush overtones inherent in the fine woods of your instrument and last up to five times longer while retaining natural feel and clear, full tone. These are light gauge, .012 - .053. If you are paying higher prices for other brands of coated strings you owe it to yourself to give these a try. I have been using the Dura-Coat strings since 2017 on my guitars. Over the 60 years I've been playing I have used all the major brand coated strings, these have performed as well or better than any of the others I have used. They sound great and last longer than any of the others. The first set I tried I installed on my Rick Turner Renaissance design acoustic in late August of 2017. I played this particular guitar at least a couple of time per week at church and at gigs of which I had 70 that year. I finally changed the strings in early June of the following year, 2018. And that was they were in need of tuning a bit more often. They still sounded good and showed little or no wear or corrosion. I just wanted to see how long they could go. That's 9 1/2 months! I don't know how they'll hold up for you. This was an experiment just to give them an extreme test run. Do the math, though. They are 33% to 40% less expensive than the other brands (which I also sell, by the way). If they are just as good and hold up just as long as whatever you are using currently, they are a better value compared to what you've been playing and you're getting the same great tone and better string life. The savings are exponential if you get longer use of these. You should at least give them a try just to see for yourself. If you're thinking that it is utterly stupid for me to try to sell you a cheaper string than other strings I also sell, you'd be correct. It makes no economic sense. Being a musician myself, however my business focus has always been to give my fellow musicians the best products at the best prices I can. Musicians don't like to waste money. Been there. Done that. So if I can share a good product with you, and you agree after trying them, we will do business again. And that's the bottom line.