Treated with Martin's Cleartone proprietary technology for a longer lifespan than regular strings
Made for 12-string baritone acoustic guitars
1st set: .012, .018, .026, .034, .047, .070
2nd set: .013, .018, .011, .016, .023, .034
92/8 bronze provides a bright and vibrant tone
Martin MSP7750 SP Lifespan - 92/8 Phosphor Bronze 12-str Baritone Acoustic Strings At C. F. Martin & Co., they design their strings like they design their guitars - with maximum performance, exacting tone, and playability in mind. They know that musicians demand strings that will perform on stage or in the studio or wherever your music takes you. Martin SP Lifespan strings take Martin's legendary quality even further, by giving your guitar exceptional tone, clarity, and response that anyone at Sweetwater can recommend. Treated with Martin's Cleartone proprietary formula, SP Lifespan strings repel dirt and oil and play like new, long after conventional strings wear out. Treated with Martin's Cleartone proprietary technology for a longer lifespan than regular strings Made for 12-string baritone acoustic guitars 1st set: .012, .018, .026, .034, .047, .070 2nd set: .013, .018, .011, .016, .023, .034 92/8 bronze provides a bright and vibrant tone