Altenew's coordinating mask stencils are designed to work perfectly with their stamp sets! These handy mask stencils are made out of a thinner material than their regular stencils so you can easily stamp over them, or use with your favorite coloring mediums! Position the positive cut pieces over their coordinating images with a bit of temporary adhesive, then stamp over with another image. When you remove the stencil, it will look like the second image is behind the first! There are 5 mask pieces in this package.