We have isMD - do we have isXS or isSM?

I’m trying to test the following code in various devices to make sure I’m implementing the correct CSS that works in all devices

Using landscape on iPhone & iPad - it seems that isMD is !False -> True in both cases

<button ion-fab [attr.mini]="! isMD ? '' : null">
      <ion-icon name="md-lock"></ion-icon>

I would expect to have difference variables for iPad ( which is much bigger ) and for iPhone
But there’s no isXS or isSM so I can test those as well.

How can I get the affect of - on iPhone - place a mini Fab, and on iPad - regular Fab ?