DR Handmade Strings BKB6-30 DR Strings BKB6-30 Black Beauty 6-String Bass Strings 30-125 Advanced black coating for EXTRA-Life and Protection Extra-Life Black Beauty strings offer 6-string bass players a superior black coated string without sacrificing the crisp tone, clarity, and volume of traditional DR handmade strings Extra-Life has a super thin advanced 0003" Black coating on the plain strings and on the wrap wire Extra-Life Black Beauty strings offer 6-string bass players a superior black coated string without sacrificing the crisp tone, clarity, and volume of traditional DR handmade strings