Martin Authentic Acoustic SP 80/20 Bronze Medium, 13-56 Overview
Designed to cope with demanding practices and schedules. Martin Authentic Acoustic SP 80/20 strings feature their highest tensile-strength core wire, and are tin-plated for enhanced corrosion resistance. These Acoustic SP strings provide players with good tuning stability as well as a true and consistent tone, throughout gigs.
Manufactured with 80% copper and 20% zinc, these acoustic guitar strings yield a bright and ringing tone. These Acoustic SP strings include gauge 13-17-26-35-45-56.
 
Gauges: 13-17-26-35-45-56
Tension: 193.0