Cart 0 Item(s)
Order Subtotal: $0.00
0 Item(s) in Cart
Same Day ShippingFree Shipping
Fast. Easy. Friendly
Call Us. We'll Help.877-830-0722

Martin SP Flexible Core Phosphor Bronze Acoustic Guitar Strings

Buy Discount Martin SP Flexible Core Phosphor Bronze Acoustic Guitar Strings On Sale Online and Save
Martin SP Flexible Core Phosphor Bronze Acoustic Guitar Strings
Martin SP Flexible Core Phosphor Bronze Acoustic Guitar Strings
Martin SP Flexible Core Phosphor Bronze Acoustic Guitar Strings
View More Images
$4.89List Price $6.99

In Stock & Ready to Ship!

Item Description

It isn't just about flexibility; it's about bending the note till it rings true. 

Martin SP Flexible Core strings have a thin but strong core wire and a thicker wrap wire which allows them to be flexible and easy on the fingers while holding standard tension. SP Flexible Core strings feel soft to the touch, making them ideal for beginners. But don't be fooled by comfort! Just ask Tommy Emmanuel who performs with Martin's SP Flexible Core strings night after night. With SP Flexible Core, you get total flexibility and total control.

MFX775 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


14 Reviews
71% (10)
7% (1)
21% (3)
0% (0)
0% (0)
79% Recommend this product (11 of 14 responses)
By Walt
Loveland, CO
February 17, 2018
If Tommy Says there Cool
These are Live strings, very Springy! And do feel nice. I prefer a little more warmer tone. But these are good Strings.
ProsLively Sounding Feel nice
Conslittle to springy..;^)
By Jerry Mcwilliams
akron ohio
October 20, 2017
Not good for strumming, unusual fog like sustain that doesnt lift when you switch chords
I bought these for my daughter's taylor GS MINI. She is 11 so I figured these would be good for her fingers and I figured I would use them too. After stringing her guitar up i couldt quite put my finger on what was wrong. Sustain! The chord rings strangely and carries over into the next chord. Very bizarre for an acoustic guitar. Never experienced this with ANY other type of guitar string. I suppose these are great for a more nuanced play style.
August 30, 2017
I really expected to like these strings. They were OK, but nothing special at all in my opinion. They sounded pretty average to my ear, and had a tad softer feel than other strings of the same gauge. Nothing wrong with them, I just found the kind of dull and uninspiring. From Martin I much prefer EC's choice over these, I found that set to sound louder and fuller. I'd pick John Pearse 600L or New Medium PB over both Martin offerings.
By Doug Kennedy
Ashland, Oregon
August 19, 2017
Give D'Adds EXP a serious run for the money
I have used D'Addario EXP 16s for many years. I tried the Martins Flex and found them to last almost as long lasting I fingerpick using both thumb and two brass Dunlop fingerpicks and while I play at times loud and with great vorce with the picks, I don't beat on them. I have lots of guitars and use dAdds electric on my hollow body gibsons and my les pauls and strats but martin really hit it out of the park with these strings for acoustic guitars of which I have 30. They all get played and even at the great prices the Strings and B folks have on the d'Adds exp16s, the cost can be a little high for that many axes. Surprised was I at how long the Martin flex's lasted. Yes they lose some brightness after a while but even their well worn sound is really worth a listen. They are my favorite string now, I just hope martin doesn't change them. I play and record 4 hours per day using one or two guitars. Each of my instruments have certain characteristic that are unique but even so, if I play any one guitar for extended sessions the Martins are good for at least 2 weeks , as long as I don't beat the hell out of them with a flat pick. Give them a shot as you may find their beauty remains even if they lose brightness. Very SWEET string and extremely stable in tuning. Doug Kennedy Fingerpick Magazine
By sudharsanam
trichy, tamilnadu
July 24, 2017
Not as expected
I bought these these strings thinking that it would be more flexible and hence suitable for my fingerstyle playing but I find it a little difficult to bend when compared to other strings I've tried
ProsWarmer sound
ConsI couldn't find it that flexible
By Aleksandr
East Hanover, NJ
April 19, 2017
I like it
Very softy strings
By Devon
Chillicothe, TX
October 29, 2016
Loved the sound
The had afresh sound and looked good
By Alisa
Moscow, Russia
July 20, 2016
Usually I prefer 80/20 bronze strings for my acoustic guitars, but these strings surprised me with rich low-end and very balanced high-end. The playability is second to none, just ask Tommy Emmanuel. )
ProsTone Harmonics balance Playability
By Gregory
Winfield, KS
May 4, 2016
Great Strings
Great back up strings. I prefer the SP LIfespans for longevity, but these are great to have in the case in case you find your current strings lacking and need to liven things up for a show.
ProsCheap Good tone handles alt tunings well
ConsDon't last very long (but duh)
By David
Southwest Florida
November 3, 2015
Just about all I use now
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.
By Sasha
May 16, 2015
Can't miss with these
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.
ProsSound amazing!
ConsUse them on 2 gigs and bye bye.
By Mike
March 10, 2014
I'd give them 6 stars if I could.
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.
ProsTheir tone stays great for weeks. The strings are easier to bend. Perfect for my smaller guitars.
By Marc L
Buffalo, MN
November 19, 2013
Competent compromise
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.
ProsGood even tone, excellent playability, very good projection. And they really stay on pitch!
ConsThey don't seem to last, tone-wise, as long as say the Martin SP's.
By Dave C
September 27, 2010
I'm hooked!
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.

Previously Viewed Items