10 plain nylon strings (5 courses), 019/019, 028/028, 033/020, 024/024, 030/030. Charango tuning is GGcceEAAee from low to high (5th course to 1st course). The G E & A are in the octave below c & e, A = A440. Each string is about 46" long. Light tension on standard scale (13.75 - 14.55", 35-37cm) compared to medium tension Aquila, Mari, or Medina sets, or heavier Pyramid sets.