hook is a metal that protrudes from the corner of the bracket.
Some of the hooks are movable, but most of them are part of the body of the brackets.
Spiral or elastic springs are connected to these and provide the possibility of adjusting the distance or changing the alignment of the jaw bones. The patient may feel a little hard at first, but gradually the patient gets used to it.
Left and right
They are sold in a package of 10 pieces with the highest quality in Tehran Sanat Helal Development Company.