Aquila Tenor Ukulele Set 13U Contains Red Series 3rd String High G Tuning allowing one, on the one hand, to rediscover the sonorities familiar to the great 19th and 20th century masters; and guaranteeing, on the other, a stability of tuning higher even than that of the best gut and nylon strings. set / Tenor Ukulele 4-string g' c' e' a' - Regular Tuning, Key of CMade of New NYLGUT3rd (C) wound stringHigh G-stringString length: approx. 76 cmNylgut strings include promptness of attack, excellent timbre and a truly remarkable stability of intonation. The new synthetic materialNew Nylgut (synthetic gut) has the same acoustic properties as gut - but without its typical defects - (high cost, limited duration and high instability under varying climatic). Nylgut has precisely these qualities: