DR Strings Dragon Skin+ Coated Accurate Core Technology strings give you huge tone, outstanding playability and exceptional durability. Packed with patented technology, Dragon Skin+ upgrades both the core and the wrap wires to be exceptionally musical, balanced and loud. Accurate Core Technology creates grooves on the core to cradle the wrap wire into place, allowing the strings to ring out fully. A micro-thin coating on the wrap wire provides long life while feeling like an uncoated string.