The Union Arena: Fullmetal Alchemist booster box contains cards from the popular series, with each pack including 12 cards from four rarity levels: Common, Uncommon, Rare, and Super Rare. The box offers 100 card types plus 6 AP card types and includes alt-art cards, with the chance to find rare voice actor signature cards. The set features characters like Edward Elric and Roy Mustang, aiming to expand your collection and deck-building options. 
Key features of the booster box
Packs per box: A full booster display box contains 16 packs.
Cards per pack: Each pack contains 12 cards.
Card types: The set includes 100 card types and 6 AP card types.
Rarities: There are four main rarity levels: Common, Uncommon, Rare, and Super Rare.
Special cards:
Alt-art cards: These are included for collectors to find.
Voice actor signature cards: Some cards feature foil signatures from the Japanese voice actors, sometimes with a line of dialogue from the character.
Characters: Popular characters from the Fullmetal Alchemist series, such as Edward Elric and Roy Mustang, are featured.