Preparation materials: needle-nosed pliers, ruler, copper wire.

1. Measure the same size with a ruler with needle-nosed pliers and cut it off;

2. First prepare a copper wire, as shown in the figure, hold one end with a needle-nosed pliers;

3. Winding of such coils;

4, the two ends are wound like this;

5. Then select a point on the center line;

6. Fold it into a picture;

7. Just fold it again.

8. Chess pieces can be linked together;

9. Series connection;

10, finally finished.