BlackSmith ukulele strings are made with the finest materials and manufacturing using state-of-the-art automatic calibration controlled extrusion machine. Mono filament is made from a single fiber of plastic ensures a long lasting with increase sustain and purer tone. Extrusion machine produces strings with a very consistent diameters and even tension, resulting in stable tuning, accurate intonation, and superior playability. With BlackSmith ukulele strings, you will experience the perfect balance of consistency, tone, durability, and performance. ​