Abstract: A lightweight assembly (1) suitable for displaying a poster (2) and erected without the use of tools by assembling a set (J) of members. The assembly includes two side members (3), a transverse base member (4), two crossbar members (5), four flexible upright members (6), a central member (7), a device (8) for assembling an H-shaped base, and a substantially X-shaped upright structure (6, 7) erected on the base (3, 4) and curved inwards towards the poster. The crossbar members (5) are arranged between the legs (3) of the base and between the flexible members (6).