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 its heat optimally and that the heat is evenly distributed throughout the teapot. Fill the filter with tea or tea herbs. Then fill the teapot with boiling water. Let it steep. 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 has dimensions of 14 x 12.8 x 8.5 cm.