C.F. Martin & Co. MSP4250 Phosphor Bronze Acoustic Guitar Strings, Medium Gauges: .013 - .056 Made for flat or fingerpicking styles Boost at 4th and 5th strings for enhanced midrange and more volume <a href="https://www.amazon.com/b?node=14770868011"> International products </a> have <a href="https://www.amazon.com/gp/help/customer/display.html/ref=nav_cs_help?ie=UTF8&nodeId=202045290"> separate terms, </a> are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. Manufacturer warranty may not apply <a href="https://www.amazon.com/b?node=14770868011">Learn more</a> about Amazon Global Store.