Aquila 65U Ukulele TENOR Low-G Tuning, Key of C - GCEA (Bionylon&reg;/wound G-string) reduction of the 50% of carbon dioxide's emissions in the atmosphere during the polymer-synthesis than the other common Nylons employed for musical strings. set / Tenor Ukulele 4-string g c' e' a' - Low G Tuning, Key of CG-string tuned 1 octave lower (low G), and wound (silverplated copper wound)C/E/A made ofBionylonString length: approx. 76 cmThenew eco-friendly synthetic strings for Ukulele. These strings are made of rounded, smooth Bionylon monofilaments - a new material that boasts excellent acoustic and mechanical properties and provides warm and mellow perfomances. Bionylon is, for its 67-70%, a plant's derivate (castor oil); this allows a