DR Strings Dragon Skin+ Coated Accurate Core Technology 4-string multi-scale quantum nickel bass strings give you a huge, balanced tone and outstanding longevity. Packed with patented Accurate Core Technology, Dragon Skin+ upgrades both the core and wrap wires to be exceptionally musical. Grooves on the core cradle the wrap wire, allowing the strings to ring out fully. A micro-thin coating provides long life while feeling like an uncoated string. Designed to feel and sound better, Dragon Skin+ strings are unlike any you've played.