To prevent rises
When you bake a cake, it is wise to your blindcake base baking so that it is crispy and firm before you make the whole cake. These baking pearls help to bake the puff pastry cooked without it rising. All you have to do is distribute the pearls over the dough in the baking tin. The pearls weigh the cake bottom and distribute the heat evenly , so that the pie bottom retains its shape and does not rise.