Instrument: 4/4 Full Size Viola (typically fitting up to 16" instruments).Core Material: High-Carbon Solid Steel Core.Winding Material: Nickel Chromium (Ni-Cr) or Nickel Iron (Ni-Fe) Alloy Winding.Included Strings:A - 1st: Steel Core, Nickel Chromium Wound.D - 2nd: Steel Core, Nickel Chromium Wound.G - 3rd: Steel Core, Nickel Chromium Wound.C - 4th: Steel Core, Nickel Chromium Wound.