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

Problem:
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>
</button>

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 ?