Prevents cake from sticking to the bottom of the cake pan when placed at the bottom of the pan prior to filling.. No additional butter or grease means less fat. Good in temperatures up to 450 degrees. Regency parchment paper rounds are pre cut to fit 8, 9, 10 inches cake pans. Prevents sticking when placed in the bottom of the pan before filling and baking. Eliminates the need for grease or butter.