Martin® Authentic Acoustic® Marquis® Silked strings feature a soft silk wrap that prevents wear and tear on the bridge holes and bridge plate as you play. The added thickness also ensures that bridge pins will stay locked in place, even in older bridges with worn holes. Martin's impeccable standards for acoustic guitar tone are embedded in their string design and precision manufacturing process. These extra light .10-.47 strings are perfect for older 12-string guitars that could use a break in tension and bridge wear.