What is this Christmas decoration called?

A ball of (artificial) greenery, larger than a softball and smaller than a soccer ball. Probably 8 inches or so in diameter.

I’ve got two now – one is fake pine , with scattered holly berries; the other is fake holly with lots of holly berries. Just received the latter as a gift.

They both have loops of string attached to hang them over a doorway.

I need to know how to phrase a thank-you note, and I’m drawing a complete blank.

Kissing Ball.

Thanks!! That’s it.

But shouldn’t it have mistletoe in it?

It’s supposed to have, yes. Traditionally, a single sprig of mistletoe is tied to the bottom of the ball.