Umbra Loft Papillon wall art, 2008 Target brand, set of 20 butterflies,
5 of each size, ranging from 5.5"-3.5".
I'm not sure what these are made of but it seems to be a thick, hard, sturdy, white plastic. They come with pin tacks for hanging. Once the tacks are in the wall the butterflies snap onto the tacks. The butterflies can also be snapped off and rearranged for a new look.