There are 18 Constellations in this deck of 3.5 x 5" cards. The constellations include : The 12 signs of the the zodiac as well as Orion, Pegasus, Cepheus, the Big Dipper, Draco, and Cygnus. They can be used for identification, creating the constellations with gem stones. You can punch holes in them and shine a light through on to the wall or get two decks and cut them for Montessori 3 part cards and memory games.