All Flair models are built with the same solid aluminum components as the original Flair. Both the Classic and Signature models utilize our smaller, standard brewing head, but the Signature series comes standard with a bottomless 2-in-1 portafilter. Another difference between the Classic and Signature lines is that the Signature models go through a process of hand polishing due to the Chrome, Cool Black Matte, and Copper finish. The PRO 2 series comes in the same colors as the Signature line, but features our larger PRO 2 brewing head, a pressure gauge and other upgrades! See below for more information.