These coated black bass strings are on a round core, and come in a 4-string set. The DR K3 Black Beauties aren't just coated to look great, although that helps, the coating process improves the performance of these strings and makes them more corrosion resistant.
DR K3 Black Beauties Electric Bass Guitar String Gauges
CALIFORNIA PROPOSITION 65 WARNING
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.