The base for the butterfly is stitched:
It, too, will have detached buttonhole wings attached over the base.
The base is stitched in Soie Ovale, which has a beautiful sheen and comes in glorious, clear colors. The photo does not do it justice.
But . . .
It snags on air.
It also snags and shreds as it moves through the linen. It tangles and shreds on itself. And if there is the tiniest rough spot anywhere on your body, including the soles of your feet, it will find that spot and snag, shred, and tangle on it. Changing the needle doesn't make any difference--it isn't the needle's eye that causes the problem.
In short, it's a right royal pain in the posterior to use, but it does look marvelous when it's stitched.