Get the long-lasting Marquis tone. Gauges 12-16-25-32-42-54.Martin SP Marquis strings are designed for maximum tone and longevity. Ultrahigh tensile strength cores resist breaking. Acoustic bronze finish provides greater string life. The silk wrapping on the end is not only a traditional symbol of quality, but provides tighter seating of the string at the bridge pin and helps reduce wear on bridges and bridgeplates.