... :Crisper silicone sealing rings are the major part of the box, they fix on the lid, making waterproof and sealed effect ... ...1. With very good seal performance, waterproof not leak;2. Preservation effect is good, completely a virulent insipidity;3. Can be ... raw material, crisper seal ring mainly used for last box, lunch box, heat preservation box, the incubator, water cup and so on... With household ...