Review (1/5): This does not work as advertised
Don't waste your money. First thing, the stamp comes out of the holder so it won't stay in place to make the proper shape. Second, if you can get the powder applied to the stamp properly and then apply it to your brow it seemed possible to cover your own brow and get a new shape.
I even tried practicing on a Styrofoam head and it was impossible to get a good-looking eyebrow even on that. I didn't ask for a refund. I figured be a pain in the neck to try to return it.