1. String inside is high-quality nylon wire. 2. Feel moderate 3. String is , suitable for the early stage of practices. : Model: NX35 / 2845 Suitable for instruments: classical guitar Net weight: 18g Product Size: NX35 / 2845: E \ B \ G \ D \ A \ E 0.028 \ 0.032 \ 0.040 \ 0.030 \ 0.036 \ 0.045 inch 0.71 \ 0.81 \ 1.02 \ 0.76 \ 0.91 \ 1.14 mm color: As Shown Material: nylon + steel Product packaging size: 11 x 14.5 x 0.8cm Package Contents: 3 x guitar Strings (6pcs/set) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.