These pots are made from the famous Zisha clay found in the 'Purple Clay'- mines in China. The orange/red and sometimes brown colours are from special layers in the mine. Choose the size you want. Typical Gong Fu size teapots are between 50 and 200 ml. The larger teapots are convenient when you want to use them as a pitcher for a larger group of people or when you want to use mugs for your tea. But remember, the sizes between 50 (for one person) and 250 ml. hold the most fragrance and flavor to your tea while you enjoy your tea ceremony. Please also visit http://www.highendtea.eu/ for more high quality teapots and teaware.