Martin Authentic Acoustic Marquis Silked 80/20 Bronze strings offer extra protection for your fine 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. Martin's 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.