The Hogwarts School of Witchcraft and Wizardry separates its student into one of four houses. The selection is done by a magical sorting hat that knows the hearts and minds of each student. The Slytherin house takes those who are ambitious, cunning, shrewd and maybe a little devious. The Dark Lord Voldemort came from the house. These crest house cufflinks have a fixed back with the HP logo and the Snake on a green background associated with the house. Always be careful to choose good, because evil is easy to find.