Inspired by the forests of Boulogne on the outskirts of Paris, this design shows the embossed age rings of a tree. Teck brings a rustic elegance to your table.With excellent heat conduction and retention, Pillivuyt gratins can be safely used in ovens up to 550 degrees F and will keep your culinary creations warm long after you bring them to the table. Pillivuyt gratins are thermal-shock resistant and can be taken directly from the freezer to a hot oven without harm.