Material: K3 Clear Coated Phosphor Bronze. Hexagonal Core Wire with Ball End.� Dragon Skin sets feature coating on all strings, including the brass-plated steel trebles for extra volume and warmth The strings have more projection, fewer unwanted overtones, greater clarity and articulation than uncoated strings 11, 15, 22, 30, 40, 50 String Length: 38" Set of Six Strings Made in US, New Jersey by DR Music Inc Free Replacement against manufacturing defects only for the products imported by Trimac Products Private Limited contact