So that they don't "topple over in a breeze" we recommended maximum picture sizes for each type of holder.
Place Card Holders for pictures not larger than 3 x 3" (8 x 8cm)
Photo Holders for pictures not larger than 6 x 4” (15 x 10cm).
Dimensions:
Place Card Holder 33 x 26 x 15mm
Photo Holder 45 x 35 x 16mm
Supplied boxed.