Cool find from a local estate sale! Not sure what this was used for but it has lots of potential - it could be incorporated into mixed media collage art or used as a stencil or as wall art. It's 1/4" dense flexible rubber. It's kind of a distressed blue on one side and a grayish color on the other side. I'll be listing other items such as letters and numbers and a smaller sale stencil so stay posted!