Here's why it's tricky to give you a specific number:
* Different shapes: Hair brushes come in round, rectangular, oval, and even paddle shapes.
* Size matters: A brush for detangling long hair will be much larger than one for styling bangs.
* Handle length: Brushes can have short, medium, or long handles.
To find out the size of a particular hair brush, you'll need to check the product description or measure it yourself.