Better selects

Tip

Use 5 to 15 options within your select boxes.

Why?

http://uxmovement.com/forms/stop-misusing-select-menus/

But...

You have a lot of options to offer?
Well, then I recommend you to use some select box enhancement libraries like: Chosen and Select2. With then, you can add an auto-complete input field, improving the user experience of choosing in large range of options.