Looking for a teapot that retains its optimal heat? The teapot from Cosy & Trendy is made of cast iron. Cast iron ensures that the tea retains optimal heat and the heat is well distributed throughout the teapot. Fill the filter with tea or tea herbs. Then fill the teapot with boiling water. Allow to steep completely. The longer you wait to remove the filter, the stronger the tea will be. The tea filter has a diameter of 6.8 cm. The teapot itself measures 14 x 12.8 x 8.5 cm.