Martin MA140 electro / acoustic strings SP 80/20 12-54 light / average

This is the bog standard gauge suitable for most acoustic and electro acoustic guitars.
This gauge is the standard gauge (gauge, not MAKE) that seems to be fitted to 95% of new acoustic guitars.
These are described as being ‘LIGHT’ gauge strings but 99% of guitarists would disagree, these are ‘Medium’ in terms of tension and thickness. You can buy ‘Medium’ gauge strings but they are actually fairly heavy compared to those fitted by 99% of manufacturers and will hurt your fingers more but make your guitar sound richer and fuller.

Individual string Gauge as follows:
12-16-25-32-42-54

These strings are engineered with the performer in mind and they will always stand up to rigorous practice and performance schedules. We start with our highest tensile-strength core wire, then tin-plate it on all six strings for added corrosion resistance; because what you don’t see matters! When coupled with our highest quality wrap wire you get consistent true tone that you can count on song after song. Available in 80/20 Bronze and 92/8 Phosphor Bronze.

Martin Authentic Acoustic SP® strings offer excellent tuning stability, corrosion resistance and great playability.