ACOUSTIC GUITAR STRINGS LIGHT: .013 .017 .026w .035 .046 .056 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-N600MB$12.92 String Coatings for Longer String Life