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Martin SP Flexible Core Phosphor Bronze Acoustic Guitar Strings

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$4.69List Price $6.99

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Item Description

This new generation of Martin FX Flexible Core Phosphor Bronze Acoustic Guitar Strings is what "The Who" would've been talkin' bout if they'd been around back then.

“I love Martin FX strings - they’re the best strings I’ve ever used. My guitars love them too.” — Tommy Emmanuel

Martin FX Flexible Core Phosphor Bronze Acoustic Guitar Strings offer a bright tone with a thinner more flexible core wire that provides great player control with sharp attack, and improved harmonic sustain. While the tension stays the same, the more flexible string also decreases finger fatigue making it perfect for the seasoned performer or the practicing beginner.

Top artists use this Phosphor Bronze string for live performances and studio recording for its consistent, slightly warmer tone out of the box.

Custom Light 11 15 23 32 42 52
MFX740 Light 12 16 25 32 42 54
MFX750 Medium 13 17 26 35 45 56
MFX130 Silk/Phos 11 13 23 28 38 47
MFX700 Custom 12 String 10 10 14 14 25 10 32 12 42 18 54 27

Martin & Co. designs and manufactures the strings themselves. Like their guitars, each string is made with patience, care, and precision with only the highest quality materials producing strings with exacting tone and superior performance. Not only are their packaging materials minimized and 100% recyclable, but the envelopes reduce the tarnishing effect on the strings.

Not what your are looking for? Check out our full line of Martin Strings!

Product Video

Joe Coffee talks about Martin FX Flexible Core Acoustic Guitar Strings


Martin SP Flexible Core Phosphor Bronze Acoustic Guitar Strings
5 Stars based on 5 Review(s)
Southwest Florida
5 Stars
I would recommend this item to a friend.

Just about all I use now
November 3, 2015
I first tried these strings on my vintage Martin D-18 since they put less tension on the neck. To my surprise, the tone was incredible and playability much easier than other strings i've used in the past 55 years. I now use them on my HD-28 also.

5 Stars
I would recommend this item to a friend.

Can't miss with these
May 16, 2015
One of the best strings i have tried. They wear out preety quickly, but when they are new they sound amazing. If Tommy doesn't know, who does :) I use them on ovation legend.
Sound amazing!
Use them on 2 gigs and bye bye.

5 Stars
I would recommend this item to a friend.

I'd give them 6 stars if I could.
March 10, 2014
I have generally shied away from medium gauge strings because of the pain associated with them. These strings are super. I bought the MFX745's and the medium light Phosphor Bronze make my acoustics sing. I like the way they sound after they get broken in. They're still bright but really balanced. I use them on my OM and my 000 because they're so perfect for fingerpicking. Try a set out. They made me a believer.
Their tone stays great for weeks. The strings are easier to bend. Perfect for my smaller guitars.

Marc L
Buffalo, MN
5 Stars
I would recommend this item to a friend.

Competent compromise
November 19, 2013
These things are a very good compromise for volume, tone and playability. The first time I strung them up was right before a 5 hr long Jam Camp. My Seagull S6+ played bright and clear. The other players were surprised by that little box's projection in a room full of mandolins and banjos. The strings have very even tone from top to bottom, the base wasn't muddy and the treble wasn't over-bright. And my fingers weren't taking a beating over the duration of the jam session. Lots of flat-picking, hammer-ons and pull-offs with a fair amount of bending on the blues numbers but noticeably less strain on my fingers. But the thing that really amazed me was how little tuning adjustment was needed even with relatively new strings. They broke in very quickly and just hung in tight.
Good even tone, excellent playability, very good projection. And they really stay on pitch!
They don't seem to last, tone-wise, as long as say the Martin SP's.

Dave C
5 Stars

I'm hooked!
September 27, 2010
I tried out these strings because they were on sale but now I am hooked on their sound. I use them on a Martin D18-V and they sound incredible. I have tried a lot of strings but these are the perfect combination with my guitar.

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