This tempered glass is 20 times harder than regular glass. It is impervious to paints, inks and glues. What doesnt wash off will easily scrape off with a razor-blade. This product will dull rotary blades at a slightly faster rate than traditional cutting mats. The soft rubber feet will keep it stable on any surface. Perfect to iron on, this grid is designed for all your crafting needs. 12in x 16in