There are also cards of more value than "rare" cards: foils and holofoils. "Foil premium" cards are partially "shiny", having thunderbolts and stars as theme for the "additional covering". These are normally rare cards, but common and uncommon foils do exist. "Holo-portraits premium", (colloquially "holofoil") are the most rare and the most valuable of all types of cards. These cards are only available for "character" cards, which have the portrait of the character on them (origin of name). They are similar to foils, except that the picture of the character has a holographic quality that gives the impression of "popping out".