This type of menu cover fixing is perfect for a simple four-sided menu; one you could print on card and literally fold down the centre to create a neat booklet. All you need to do is tuck the card behind the elasticated cord (which is subtly concealed through a straw-like structure) to hold your menu neatly in place.
This fixing mechanism is not limited to four sides to view, you can show as many as you like in multiples of four; eight and twelve is also possible.