Martin MSP7600-Kit1 SP Lifespan 92/8 Phosphor Bronze Acoustic String, Extra Light, 12-String, 4 Pack Treated with Martin's Clear tone proprietary technology for a longer lifespan than regular strings 92/8 phosphor bronze provides a classically expressive tone Extra Light gauge .010, .010, .014, .014, .010, .023, .012, .030, .018, .039, .027, .047 Includes: 4 Packs of Extra Light, 12-String, guitar strings & ChromaCast 4 Pick Sampler & string widener