1. String inside is high- nylon wire.2. Feel moderate3. String is durable, suitable for the early stage of practices.: Model: NX35 / 2845Suitable for instruments: classical guitarNet weight: 18gProduct Size: NX35 / 2845: E B G D A E0.028 0.032 0.040 0.030 0.036 0.045 inch0.71 0.81 1.02 0.76 0.91 1.14 mmcolor: As Shown Material: nylon and steel Product packaging size: 11 x 14.5 x 0.8cmPackage Contents: 1 x guitar Strings (6pcs/set)Only the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia