Martin MA180 Acoustic SP 80/20 Bronze Guitar Strings 10/47 Ext Light 12-String

Features: Strings designed by C.F. Martin & Co. to provide superior tone for your acoustic guitar Silk-wrapped ball ends protect your bridge and increase longevity Highest-quality materials mean outstanding tone, response, and durability Strings subjected to Martin's rigorous premarket testing to ensure consistency and quality Gauges .010/.010, .014/.014, .023/.010, .030/.012, .039/.018, .047/.027 Core Material: Tin-plated Steel Winding Material: 80/20 Bronze Non-coated New, unopened package. Buy from me. I'm a small business. And very nice. :)