지름 : 약 5~6mm  

NS-057 Midnight is a deep fully opaque blue. It is great for stringers and thin cane work and can be stretched out far! It is heat and flame sensitive. It must be warmed up slowly and once glowing heat gently. Because the color is so intense it must worked in an oxidizing flame. If the flame is not oxidizing enough, the color will develop grayish brown streaks.