We are proud to introduce the Bionylon® , the first eco-friendly synthetic string in the world. These Ukulele strings are made of rounded, smooth Bionylon® monofilaments - a new material discovered by us- that also boasts excellent acoustic and mechanical properties. Bionylon® is, for its 67-70%, a plant’s derivate (castor oil); this allows a 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. Warm and mellow perfomances! Bionylon Handmade Italy