The size is chosen by the space available rather than the message, so it belongs on shelf edges, place settings and crowded counters. Keep the content to a few words, since anything longer becomes unreadable at this scale. Weighted or angled bases stop them being knocked flat. Confirm the orientation. See sign holders, A5 sign holders and retail signs.

A6 six sided sign holder shown on a bright cafe counter with the original clear side panel design and printed insert visible.
A6 Sign Holders

Shop A6 sign holders for table signs, price notices, QR codes, counters, events and compact displays.