Modern strings may be gut, solid steel, stranded steel, or various synthetic materials, wound with various metals, and sometimes plated with silver. Strings have a limited lifetime. Apart from obvious things, such as the winding of a string coming undone from wear, players generally change a string when it no longer plays true, losing the desired tone. String longevity depends on string quality and playing intensity.
How to change a violin string:
1. Before installing the strings, especially when change the whole strings set, firstly put a piece of cloth or soft paper with slight thickness beneath the line board as hurter to avoid danger. It is important to protect the faceplate of the violin. Especially for the normal fine-tune violin, once some problems appear, even slightly adjusting the strings may crash the faceplate.
2. The strings are installed in order. Firstly, the top note string the violin E string, then the lowest not string the violin G string. To begin with, place the metal ball beneath E string to spinner.
3. Put the upper edge to the punching of the chord axial; please be attention that there should be a distance of 5-10 mm between the strings and punching.
4. Take string E as an example, the "hand shank" of the chord axial, it also called the place of hand twisting, which is on the right side of us. Now please note that you should rotate the strings towards the left side. And you must press the left part down to the button at the first round, so that the strings will never break off for the unsuitable fixation of the top edge.
5. After winding towards the left side about a circle or one and a half circle, then move to the right side. Because the strings have to be close to the right side in the ending position, so that they could be in a line with the notch in the nut. Thus, the finally position will be the same with "hand shank" position of the chord axial. Two low pitch strings are on the left side and two high pitch strings are on the right side. 
6. Now you can enlace in a circle towards the right side closely. In order to enlace tightly and fitly, another hand that doesn´t twist axial should raise the middle part of strings. Thus strings enlaced in this way will be tight and fit wonderfully, which will not have tone tuning problems for kinking.
7. The strings with good kinking effects are like this.
8. The same with other strings. Install them in turns as the beginning.
9. After installing the two lines of EG, the line board will be far from faceplate. At this time, we could take the protective cloth or paper away. Of course, it is safer to take them away after installing two strings in the middle. 
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