DR Strings Bass Strings, Black Beauties - Extra-Life, Black, Coated, Tapered, 0-110 DR's EXTRA-Life strings offer bass players superior black coated strings 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&mdash;the thinnest coating DR knows of Contemporary bass players, as well as bass makers, who demand a taper core string to enable modern bass playing techniques, will be delighted by the superior performance Taper Core bass strings deliver Today's 4, 5 and 6-string bass players searching for increased stability in the lower registers will find great clarity and definition with DR's tapered bass strings