C.F. Martin & Co. M550 Phosphor Bronze Acoustic Guitar Strings, Medium

Pros:On my Martin acoustic, it really brings out the bass!Comfortable weight for occasional playingClassic Acoustic sound!Cons:Compared to Elixir, they're not as crisp and clear when picking single notes, the sound is a little mellower, but with more volume and bass

Excellent all metal strings for acoustic guitars. These are medium weight, phosphor bronze wound on the heavy strings, and tin plated steel on the lighter strings. As far as quality, they are made by Martin & Co, which speaks for itself. These are great quality strings.

These strings sound great on Little Martins. I am sure they would sound awesome on Standard size guitars as well. These are my go to strings!

Love these strings. I use them exclusively on all my acoustic guitars. They sound great and are very durable. I am a percussive guitar player and have yet to break one of these strings. The price is great and I keep several sets on hand to ensure I have fresh strings on my guitars.

decent, but one string broke after only a month

The bronze sound slightly better, but at least I get much longer life out of these. Put these on my $500 Samick (Gregg Bennet Design) acoustic and they improved the sound quality dramatically. Very comparable sound quality to my friends $1200 Taylor

I bought these for my little martin as recomended. The strings were good quality, but would be much better suited for a bigger guitar. I switched to lighter strings for a tone more to my liking.

These are my favorites. I only wish I could play the guitar as well as they are made.

One of my daughters was going through strings regularly and they were whatever cheap crap she could buy...these are still going strong weeks after their purchase and have a much better sound quality...now she's learnt that fairly decent strings don't cost a fortune but save money compared to the ones she'd bought.....just haven't got the money back off her yet :(

Great set of strings for the price. They give a great tone and depth to all types of playing. Whether that be strumming or finger style they sound great. Sound is superb even after a month of playing for several hours daily. For any novice-intermediate player, you'll be completely satisfied with these strings.

As good as they've always been and for a good price. They resonate well and give a full sound effect. I've tried a number of strings from other manufacturers over my 50+ years of playing, yet still come back to these.

Ottime corde... Decisamente strutturate. Il suono è molto pieno e profondo. Chiaramente non prendetele se i vostri polpastrelli sono abituati a corde morbide e sottili perché vi devastano le mani. Sul mi cantino potreste avere dei benefici perché essendo più spessa è meno tagliente ma sicuramente vi ammazzate le dita.

I am using these on my Yamaha guitar, where before I had - Martin acoustic SP medium - which I think I prefer but when these new strings have bedded in I'll update my opinions.