Our frames have a slot on the side in which you can easily slide in a picture postcard or photo in the standard dimensions of 10x15cm.
The A4 type is very suitable for the use as a frame for drawings or any poster. Very convenient for child drawings. One does not have to search for tape or a drawing pin and the drawing shows much better.
All frames have a small masked hole on all 4 sides in the back plate, so you can hang them any way you like. The small frames also have a simple wooden support to put them any place you want.