Ceramesh built-in strainer

The Komaru Kyusu is made in Tokoname, Japan, and features the unique ceramic mesh built-in strainer. Also known as ceramesh, the strainer’s design allows for plenty of room for the tea leaves to expand in the teapot as they steep and for each last drop of tea to be poured out and enjoyed.

https://hojicha.co/products/komaru-kyusu-teapot