Martin M2100 Marquis Phosphor Bronze Light Acoustic Guitar Strings (Discontinued) Leave a Comment / Uncategorized / By Denise / September 12, 2017 90GEARANK 90 out of 100. Incorporating 100+ ratings and reviews. Street Price: $5.79 Manufacturer: Martin FeaturesSet: M2100Gauge: Light 12-16-25-32-42-54Tension: 164.8Package: 6 strings