Remove delete button on select2 3.5 tag?

I'm referring to Select2 3.5.

I want to hide the close/delete button on one of the tags so that it can't be removed.

I can prevent a specific tag from being removed via the select2-removing event, and calling ev.preventDefault(), however, I also want to visually indicate that it can't be removed.

Is there a way to remove the 'X' beside the tag?