These strings are truly innovative for at least two reasons. Fristly, they do not use metals like steel or nickel that are stiff, but instead they use copper that is softer and has a higher density and result in richer acoustic performance. In fact, higher the density, better the sounds. Secondly, these strings feature a bioplastic monofilament core called 'Sugar', which is exclusively products by Aquila on a global scale. Sugar has been proven to have superior acoustic performance compared to other plastic materials as evidenced by laboratory measurements.
200U - Aquila Copper Flat Spirals Bass Ukulele Strings 18-21 Inch Scale
210U - Aquila Copper Flat Spirals Short Bass Strings 23-26 Inch Scale
220U - Aquila Copper Flat Spirals Acoustic Bass Strings 34 Inch Scale