The present invention relates to an injection device (1) having a mechanical dose size display wherein a first scale drum (10) carrying a series of first ciphers (11) and a second scale drum (20) carrying a series of second ciphers (21) are both rotatel able and axially moveable relatively to a housing (2) of the injection device in such a way that one of the first ciphers (11) and one of the a second ciphers (21) appears simultaneously in a window provided in the housing (2) thereby informing the user of the set dose. Bothe the first scale drum (10) and the second drum (20) preferable carries five ciphers (11, 21) around one full circumferential perimeter. The ciphers (11, 21) are provided in different circumferential circles and/or helically provided.
