Each Martin Sampler Pack includes:
2 packages SP4100 Acoustic Strings
1 package FX740 Acoustic Strings
Gauging (inch): .012 - .016 - .025 - .032 - .042 - .054
SP4100 — Light gauge, phosphor bronze. The specially engineered core wire provides greater durability and a true tone.
FX740 - Light gauge, phosphor bronze. Unique thinner core wire results in greater flexibility, improved control and reduced finger fatigue without reducing tension.