ACOUSTIC GUITAR STRINGS LIGHT: .012 .016 .024w .032 .042 .053 Black Diamond coats all the strings in this set with a black-colored polymer coating that serves a double-duty. 1. It keeps the oils, acids, grit, and grime off your strings to improve the string life. 2. They don't look like everybody else's strings. These strings are cool black! BD-N600LB$12.92 String Coatings for Longer String Life