Material description from manufacturer: Synthetic Stencil Material 10 mil, 0.010" thick, semi-rigid coated polyethylene stencil material. Non-adhesive material adhered to natural Kraft backing with a removable adhesive. Great for marking and stenciling throughout a wide range of applications. Resists inks, paints and stains. Coating protects against runs and smears common with plastic stencils. Safe, non-toxic and recyclable. Stencil will be shipped attached to a paper backing sheet for protection, stencil will need to be carefully peeled off the backing sheet before use.