Dunlop and Zakk Wylde worked together to deliver this set of strings, developed to withstand the punishment of the reigning Berzerker of Metal Guitar. Extensive engineering and critical road testing by Zakk himself perfected a string formula to work under the heaviest hands in rock. Designed around Dunlop True Balance technology, Zakk Wylde String Lab Artist Series Strings deliver optimal clarity and feel at any tuning. Nickel wound. Medium.