These affordable and stylish picture frames from Viet Nam are light-weight & made to hang on the wall. There are turn buttons to close the plywood back against the glass, which is included. This style is available in 3 sizes/shapes. All are rectangular although one is much longer than the other two:

The picture area of the shorter one is 13 1/2 x 7 1/2" (34 x 19 cm). The overall size of this frame is 22 x 13 3/4" (56 x 35 cm)

The picture are of the longer one is 22 1/4 x 8 1/2" (57 x 22 cm). The overall size is 31 3/4 x 14 1/2" (81 x 22 cm)

The picture are of the widest one is 13 1/2 x 10 1/4" (34 x 26 cm). The overall size is 22 x 16 3/4" (56 x 42.5 cm)