These strings are engineered with the performer in mind and they will always stand up to rigorous practice and performance schedules. These strings start with the highest tensile-strength core wire, then tin-plate it on all six strings for added corrosion resistance; because what you don’t see matters! When coupled with the highest quality wrap wire you get consistent true tone that you can count on song after song. • MFSKU 41Y19PROMO3PK05 • UPC 729789585781