Designed to cope with demanding practices and schedules. Martin Authentic Acoustic SP Silk & Steel strings feature their highest tensile-strength core wire and are tin-plated for enhanced corrosion resistance. These Silk and Steel strings deliver consistent quality and tone with a centre wrap of silk fiber providing a smooth feel. Steel strings are ideal for classical and folk styles due to its crisp and bright tone. You can rely on Martin strings to provide great performance and long life without breaking the bank. These Acoustic SP strings include gauge 11.5-14-23-28-38-47. Features Set of 6 strings Custom gauge 11 1/2 – 47 Consistent quality and tone Extremely soft to the touch perfect for players of all skill levels Smooth feel for great playability Tin plating offers added corrosion resistance Specifications Gauges: 11.5-14-23-28-38-47 Tension: 122.2