Sizzix Masking Film Sheets are a great addition to any mixed media artist's toolkit. These sheets are designed to help you keep certain areas of your project clean and clear while applying different media on top. The film is ultra-thin and has a delicate tack that allows for easy removal without leaving any visible residue or tearing your work. You can even cut it with Wafer-Thin and Steel-Rule dies, which makes it easier to align and mask off specific areas. The transparency of the film also helps you to see exactly where you are masking off. Each sheet is 8.25 x 11.75 inches (A4), providing a decent surface area to work with. Sizzix, a brand of Ellison, is well-known for its crafting and DIY products, and these Masking Film Sheets are no exception.