Martin SP MSP3150 Bronze 125-55
Martin SP MSP3150 80/20 Bronze 12.5-55 LIGHT MEDIUM
Martin SP Bronze acoustic guitar strings have a bronze flashing that provides greater durability without sacrificing tone or playability so you can stay in tune and play longer.
Martin 80/20 Bronze is an alloy comprised of 80% copper and 20% zinc. 80/20 bronze strings provide a very brilliant tone when they are initially put on the guitar and mellow over time.