Martin Authentic Superior Performance Acoustic Guitar Strings Features:

• Strings designed by C.F. Martin & Co. to provide superior tone for your acoustic guitar
• Tin-plate-coated for extra longevity and enhanced tone
• Highest-quality materials mean outstanding tone, response, and durability
• Strings subjected to Martin's rigorous premarket testing to ensure consistency and quality
• We have found the wound strings to be a little easier on the fingers than traditional round wound.