silicon seal: made of 100%silicone differ sizes and differ colors Odorless&nontoxic,unbreakable & durable ... , KB, KA, DC, DB etc, also can make on your demand; 3. Many types of O-Ring: O-type, E-type ... , Rubber seal, Rubber gasket, Rubber ring, Sealing ring, Sealing gasket. 100% silicon seal / o-ring