Its design is very professional; it can seal your dumplings correctly . dumpling will not leak when they are boiled. Sometimes the edges are not tight enough, because the flour each one used is different in viscosity, you can try to make the edge of the dumplings a little wet . (use the water ) then pressed it again to help seal better than before. the momos maker kit will allow you to make beautiful wavy-shaped momos / dumplings in a short period so that you won't be in a hurry. These molds can be stored easily to save space and are very easy to wash and clean & foe baking or microwave. These moulds are made up high grade Plastic materials.