The material is fishing line to be used "huroroka-bon" referred to as the worth (worth) strings. Stretch feature a moisture resistant, resistant to temperature changes. nuke better sound than the "than" is your preference is highly recommend. This item is, cm (Medium) With a hard material. Powerful and high tension sound, the sound you have desired of the henna. Bad there is no try the ukuleles in the ringing. Gauge Sizes are similar to a cm. Color is clear. kuriahuroroka-bon is brown, with a more delicate and transparent so you can aim the sound production compared with it.