They're 80/20 Bronze. This is also the best (runner up!) 1 D’Addario EXP16 Coated Phosphor Bronze Acoustic Guitar Strings. acoustic guitar string for your Yamaha Guitar. One thing that I like about these strings most is their crisp, kind of … But with so many types on offer, choosing the best acoustic guitar strings can feel like a minefield. Manufacturer: Elixir Model: Nanoweb The Elixir Nanoweb series of strings is one of the most popular acoustic guitar string choices. D’Addario makes quality guitar strings for all genres, but the EXP 16 is one of their best known for acoustic guitars. The new XT series of strings is one of their best till now, and the XT Classical Strings offer new innovations for classical players to achieve a better sound through their guitars. With a special Nanoweb coating designed to prolong the life of the strings up to 4x longer than average nickel plated strings, Nanowebs are perfect for those who want to avoid buying strings every month and simply put on a set and play to their heart’s content. When it comes to acoustic guitars, strings are crucial to your sound, playing as vital a role as your playing style or your guitar’s bracing pattern or tonewood. Yamaha guitars are shipped with Yamaha FG-12 Lights from the factory. The XT Classical Strings are made of a combination of the treble strings from their Pro-Arte series, with composite bass strings that have silver plating on them. It is coated with Phosphor bronze which creates a warm tone which lasts. these are 80/20 (80% copper & 20% Zink) strings that come with bronze wrap around the main core wire. The strings deliver a good volume and balance and are easy on the playing style. I bought a FG800 bundle package from Kraftmusic.com which came with 2 extra sets of strings.