Developed to withstand the punishment of the reigning king of metal guitar -- Dunlop and Zakk Wylde worked together to deliver the Zakk Wylde Icon Series Strings. Extensive engineering and critical road testing by Zakk himself perfected a string formula to work under the heaviest hands in rock. Zakk Wylde Signature Strings were designed around Dunlop High Tension technology with a bulked-up core wire for less breakage, long-life, and better definition and pitch retentions at 
lowered tunings.