The 92/8 Phosphor Bronze Authentic Acoustic Marquis Silked strings provide extra protection for your guitar. Martin Guitar knows a thing or two about pampering valuable instruments. Martin added a soft silk wrap to the ball ends of their Authentic Acoustic strings to prevent wear and tear on the bridge and bridge plate as you play. Our silk wrap puts a comforting layer of protection in place every time you change your strings. Martin Authentic Acoustic Marquis Silked strings offer thread wrapping for bridge protection, corrosion resistance and excellent tuning stability.