We love this silicone pastry map as it has size markings and a conversion chart to help you roll the perfect size pastry dough. Mat is generously sized at 18" x 25" and made of nonstick material. The nonstick material creates an ideal work surface not allowing your dought to cling to the mat. This pastry mat is heat resistant up to 600 degrees Fahrenheit and is dishwasher safe. This mat is tear resistant and should last for years.