There are plenty of people who long to be a part of the Slytherin sector at Hogwarts. For those who wished they were a part of this unique group, there is no doubt having a set of the Harry Potter Slytherin playing cards is a must. These cards measure 2.5 inches by 3.5 inches. They are made using a linen type finish. The cards feature the Slytherin crest on them designed with beautiful detail.