Adamas 1717NU, String Set for Steel-String Guitar, Gauges: .010 - .014 - .023w - .030w - .038w .047w, Coated Nuova version, Solid brass ball-end, With E6 and A5, core and coil with identical diameter, Composite gauging: A5, G3, and H2 strings are thinner than the gradations of other manufacturers, High-End premium phosphor bronze, Ultra-thin nano-coating below 1 micron = 0,001 mm is applied to the winding wire and core before the string is wound, Special alloy with higher copper content, Warm, rich, earthy sound, New environmentally friendly packaging - shrink-proof protected