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C.F. Martin Acoustic Guitar Martin Flexible Core FX 92/8 Phosphor Bronze .011 - .052, MFX-775

C.F. Martin Acoustic Guitar Martin Flexible Core FX 92/8 Phosphor Bronze .011 - .052, MFX-775
C.F. Martin
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5 Reviews
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0% Recommend this product (0 of 5 responses)
By Mike
February 23, 2018
I discovered these strings 5 years ago and have played them exclusively on my Martin DC Aura ever since. Nowhere have i found strings with such volume, clarity, and sustain. IMHO, there is nothing better on the planet. Enjoy!
By Rich
November 11, 2017
MFX-775 Flex core SP 11-52
Purchased these to try on the new acoustic I made at the Galloup Luthier School. My other 3 acoustics are Ovations and I use Martin Silk Steel to mellow the fiberglass bowl. I wanted more tension on the strings as my new build "learned to be a guitar" and settled in. I was initially amazed at the sustain on these strings. Sound is spot on for my guitar. I tried some dAdarrio phos;bronze that were nice but not as defined on the ole E and A string as the FX. I have also found the intonation on the low E was much better with these strings than any I have tested which is a huge bonus since I had to tune the low E to the 3rd fret G to get a decent balance.
By Bob from CTH
February 24, 2016
Martin Flexcore Phospher Bronze Strings
After using Elixer nanoweb for the past 10+ years I decided to try a few other brands. Martin SP Extended Life, etc. Then, I tried these. While not coated they have a lot of life to them and have an incredibly rich deep tone with amazing sustain. Unless I am stringing a guitar that is likely to be put away in a case for months at a time I think I have found my new go to strings. 12-string set also sounds amazing!
By Ruth Wyand
August 12, 2015
Martin Flexible Core PB
Great string - play 6 to 7 gigs a week and they last longer than I need them to and sound great the whole time. I've used some version of them for 5 years now and they always feel a gauge lighter than listed.
By Kevin
April 14, 2013
Martin Flexible Core FX 92/8 Phosphor
Excellent strings. Great tone, last quite a while. Good strumming/fingerstyle with a bit of wrist friendly flex.






1st E

Silvered Steel (Lock Twist)



2nd B

Silvered Steel (Lock Twist)



3rd G

Phosphor Bronze Wound



4th D

Phosphor Bronze Wound



5th A

Phosphor Bronze Wound



6th E

Phosphor Bronze Wound



C.F. Martin FX Flexible Core

"FX Flexible Core A thinner core wire with high tensile strength delivers greater player control with sharp attack, increased flexibility and improved harmonic sustain."

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