Martin MA530S Marquis Silked Phosphor Bronze Authentic Acoustic Guitar Strings Extra Light 10-47 MA530S - Gauges:10-14-23-30-39-47 Martin Guitar knows a thing or two about pampering valuable instruments. If you're looking for some extra protection for your fine guitar, Authentic Acoustic Silked strings are the right choice for you. We've added a soft silk wrap to the ball ends of our 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. Available in 80/20 Bronze and 92/8 Phosphor Bronze.Martin Authentic Acoustic Marquis� Silked strings offer thread wrapping for bridge protection, corrosion resistance and excellent tuning stability.