【Product Description】 This bottle faithfully adheres to the principles of nature, utilizing ions and static electricity generated from the combination of subtle vibrations (subtle energy) inherent in matter to create tea that is resistant to rust. According to the sales site, when you put tea in this bottle, negative ions, similar to those found in the air, gradually emanate, and the tea becomes low-potential while the amount of hydrogen increases. With continuous use, after about 5 hours, ordinary tea transforms into "low-potential hydrogen tea." I purchased this after reading Utsumin's book on hydrogen, but I only made pine needle tea once and then bought hydrogen water, so I am selling this. Cleaned. ● Material: Ceramic ● Capacity: 850ml I purchased an optional thermal case, which I will also include.