... 5*28CM 1cup to 14cups generally have 10 sides upper pot and 10 sides boiler, but the boiler sometimes has round ... model and 8-sides model.AS the 1/2 cup generealy ... is 6-sides upper pot, round boiler and 6-sides boiler.Round boiler ( under bottom or ... part) has 1/2cup, 1cup, 2cups, 3cups, 6cups, 9cups, and 12cups espresso coffee pot