DR Strings Dragon Skin+ Coated Accurate Core Technology 7-string nickel electric guitar strings give you a huge, balanced tone with outstanding longevity. Packed with patented Accurate Core Technology, the core and wrap wires are engineered to ring out fully while feeling like an uncoated string. Grooves in the core cradle the wrap wire, allowing each string to reach its maximum potential. A micro-thin coating provides extended life without compromising tone or feel. Unlike any other string you've played, the Dragon Skin+ delivers a difference you can feel and hear. With a tone that huge yet balanced and a feel that dynamic yet familiar, the Dragon Skin+ redefines what a guitar string can do for your playing.