Martin MSP6000-1PK SP Lifespan 80/20 Bronze Acoustic String, Extra Light, 10-47, 1 Pack Treated with Martin's Clear tone proprietary technology for a longer lifespan than regular strings 80/20 bronze provides a bright and vibrant tone Extra Light gauge .010, .014, .023, .030, .039, .047 Includes: Extra Light strings & ChromaCast 4 Pick Sampler