Jim Dunlop ZWN1046 Zakk Icon Medium Electric Guitar Strings 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 Heavy Core technology with a bulked-up core wire for less breakage, long-life, and better definition and pitch retention at lowered tunings. Every set of Dunlop Strings come packaged utilizing three levels of moisture protection and sealed in a VCI Fresh Technology (Vapor Corrosion Inhibitor) bag to guarantee that your strings arrive as fresh as the day they were made.