101 brush.

"This is the BK Beauty 101 brush. This is such a great foundation brush because it's got this domed shape here and the length of the hairs are tapered, so they're longer here on this side and shorter here on this side. It's very dense, but the fibers are very, very soft on this. And that is what I think makes this a perfect foundation brush. Because it's kind of shaped like the sponge, and you use it in a stippling motion, it just lays the foundation down so beautifully, and you never get any streaks with your foundation. Unlike the sponge, this lays more of the foundation onto your face. And so using a lighter weight foundation, you do get a little bit more coverage out of it."