Martin 6 String Acoustic Guitar, Right (41Y19MM1012)

se rompieron 2 cuerdas al hacer el cambio, decepcionante, esto no ocurre con rotosound

Martin Retro guitar strings are definitely of the highest quality. I have a 12 string acoustic electric guitar and these strings have given it a whole new sound, not to mention making it much easier to play with the ultra light strings. These strings stay in tune and feel so much better on my fingers. I look forward to many hours of effortless playing due to the durability and top quality coating Martin manufactures their strings with. The price will make you smile, too!

So far they are the best strings I’ve ever used.

If you're looking for Monel strings these will do it. In my opinion Monel lets the guitar sound like itself rather than the strings. Only thing I've found better is Kovar. Those are expensive.

These bronze strings are soft to the touch, keep in tune very well once broken in, and they don’t break your wallet. I humidify my music room and these don’t tarnish like other strings. On my Guild these are all I’m using now, coated phosphor bronze and that awesome Martin sound. I plan to upgrade to mahogany bridge pins next string change. I love this combination!