These monster cards pre-filled with the SRD monsters, are designed to hang on your DM screen during play for quick reference to monster stats and abilities. They can be used as part of tracking initiative or just simply as reference. One side contains the details of the monster and the other has a place for a monster's image as reference for the players.
Note that most of the cards will require you to add your own artwork though a few do have art as an example.
To use the cards, simply print them on a medium or heavy cardstock, cut on the registration marks, and fold along the double line. Note that the buttons will not be on the final print.