There are two cards per packet with one blue film and one red film. The images are on the cards so they appear to change when you switch the films (they are not 3-D). The plastic films may have crinkles from age, but still work alright. These would make nifty favors, whimsies, collectable, etc. These are along the lines of prizes from Cracker Jacks in the 1980s.
TWO (2) PIECES. Packets measure about 2" x 1-1/2". Made in Taiwan.