Martin Authentic Acoustic Flexible Core 13-56 Acoustic Guitar Strings, Medium
The idea behind these Martin Flexible Core sets is to have strings that sound and last as long as the standard SPās but with a much softer, springier feel under your fingers. They should be easier to play for longer and easier to bend too!
This is achieved by using a thinner gauge of core wire and thicker gauge of wrap wire. Naturally this affects the tone a bit; adding a little extra low-mid warmth while rolling off the low-end slightly. The brightness seems to be smooth which I can only assume is due to offset of more bronze and less core. Good strings, and Tommy loves them (as youāll find out below).
Ā
The blurb from Martin:
It isn't just about flexibility; it's about bending the note till it rings true.Ā
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.
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 minimised and 100% recyclable, but the envelopes reduce the tarnishing effect on the strings.
Product Information
Product Information
Shipping & Returns
Shipping & Returns


Martin Authentic Acoustic Flexible Core 13-56 Acoustic Guitar Strings, Medium
Martin Authentic Acoustic Flexible Core 13-56 Acoustic Guitar Strings, Medium
The idea behind these Martin Flexible Core sets is to have strings that sound and last as long as the standard SPās but with a much softer, springier feel under your fingers. They should be easier to play for longer and easier to bend too!
This is achieved by using a thinner gauge of core wire and thicker gauge of wrap wire. Naturally this affects the tone a bit; adding a little extra low-mid warmth while rolling off the low-end slightly. The brightness seems to be smooth which I can only assume is due to offset of more bronze and less core. Good strings, and Tommy loves them (as youāll find out below).
Ā
The blurb from Martin:
It isn't just about flexibility; it's about bending the note till it rings true.Ā
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.
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 minimised and 100% recyclable, but the envelopes reduce the tarnishing effect on the strings.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The idea behind these Martin Flexible Core sets is to have strings that sound and last as long as the standard SPās but with a much softer, springier feel under your fingers. They should be easier to play for longer and easier to bend too!
This is achieved by using a thinner gauge of core wire and thicker gauge of wrap wire. Naturally this affects the tone a bit; adding a little extra low-mid warmth while rolling off the low-end slightly. The brightness seems to be smooth which I can only assume is due to offset of more bronze and less core. Good strings, and Tommy loves them (as youāll find out below).
Ā
The blurb from Martin:
It isn't just about flexibility; it's about bending the note till it rings true.Ā
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.
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 minimised and 100% recyclable, but the envelopes reduce the tarnishing effect on the strings.























