Nano-Carbon Shield AOT Coated Nickel Round Wound Electric Guitar StringsBlackSmith electric guitar strings are made with the finest materials and manufactured using state-of-the-art automatic servo controlled winding equipment. USA made nickel and steel ensures a long lasting string with increased sustain and purer tone. Our proprietary computer controlled winding technology produces strings with very consistent tension, resulting in stable tuning, accurate intonation, and superior playability.The Nano Carbon Shield AOT (anti oxidation technology) coating prevents oxidation and dirt build-up on the wound strings without blocking the string ground conductivity like other brands – a BlackSmith exclusive!! Sub-Zero treated plain steel strings offer brilliant tone with a silky feel. With Black Smith Nano Carbon Shield coated electric guitar strings, you will experience the perfect balance of consistency, tone, and playability. Vacuum Sealed in Patented Anti Kink Packaging Prevents Oxidation and String Damage.