It works just like a lid, only it has a major bonus: you can just set your pot to boil and then walk away without having to worry about it spilling over.
Safe material: Food grade Silicone, it can touch food, no problem..
Unbreakable: if it is fall on the ground, it will not be broken. It is a big adventage compared with glass lid
Having this gadgets, it can fit different sizes pots.