Material: K3 Red Coated Phosphor Bronze. Hexagonal Core Wire with Ball�End.� 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