Ruffled Silicone Heart Mold by Wilton. Discover the convenience and easy release of flexible silicone bakeware! Freezer, refrigerator, microwave and dishwasher safe, oven safe to 500degreesF. One mix makes 40-48 petite hearts; 20-24 mini hearts. 12 petite hearts, each 1.5 x 1.5 x 1 inches deep; 6 mini hearts, each 2.6 x 2.5 x 1.5 inches deep.