Drinking water and milk guard aluminum cap 1.Suitable for 20mm~40mm mouth of plastic and glass bottle Adopts high-selected aluminum sheet, good anti-tension and durable. 2.The inner pad is PE polystyrene foam, which conforms to the Standard of National Sanitary. 3.It can maintain the taste of content, stable the torsional force with good sealing. 4.The cap is made in the sealed off factory which adopts motorized consistent operative production, stable quality, security and sanitary. 5.This cap guards against stealing and mischief to assure the sealing of products.