The 1st E string of the Red series set whose code 153 C and 187 C is made of a new bioplastic called 'Sugar' charged with thin metal powder.
The plastic material is soft and is very cut sensitive such as the sharp edges of the nut slot and the edge of the hole of the tuning machine that is very sharp: this is the best way in order to avoid unsuspected breakages of the E string.
The correct way to pull the strings is also explained in order to achieve a rapid and right intonation even over the 12 th fret
