The air-tight stainless steel caps with rubber O-ring seals create an oxygen barrier that preserves the integrity of your homemade juices, smoothies, and infused waters. Keep your beverages fresher longer, whether stored in your refrigerator or carried throughout your day. The durable, lead- glass construction resists staining and odor absorption—i for rotating between vibrant juices and delicate herbal infusions without residual flavors.