The violin has four strings. They are G, D, A, E.
The G string is the thickest and also the lowest string on the violin.
The D string is slightly thinner than the G string, five notes higher than the G string.
The A string is thinner than D string, five notes higher than the D string.
The E string is the thinnest , five notes higher than the A string.
See Fig. 3
The four strings have different lengths, so that each string has its own peg. See Fig.3