Our registered brand to USPTO: GOARTEA How to Choose the tea from GOARTEA Tea House? All our tea grade marked the follow standard: ———–>>>—–more better—>>>——- Normal, premium, Supreme, Top, Nonpareil Supreme. ———–>>>—–more better—>>>——- AAA, AAA+, AAAA, AAAA+, AAAAA, AAAAA+, AAAAA+++. Yixing clay (also called Purple Sand are made from Yixing clay). This Caddy is for storing tea leaves! in China, dating back to the 15th century, and are made from clay produced near Yixing in the eastern Chinese province of Jiangsu. Use with tea: Yixing Caddy are meant for use with black and oolong teas, as well as aged puerh tea. They can also be used for green or white tea, etc.