Pegs are used to hold the strings and keep it tuned. Preferably, they should be made of good quality ebony. Bad quality ebony works too much and makes the tune unstable. In cheaper violins, they can also be made from plastic. However, this provides less grip. Pegs should also be fitted in the right way to provide enough grip. They should extend al the way through, and can even stick out a little.
Pegs are a little like shoes. They should be the right size. If they are not, you can walk on them, but you would still prefer the right size.
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When you buy a violin, it’s important that the pegs are made of good quality ebony and that they fit in the peg box.