A Build Divide: Fullmetal Alchemist booster box is a Japanese TCG product that includes cards from the anime series, with the Vol. 2 box containing 16 packs of 7 cards each. These boxes feature a wide variety of cards with different rarities, including Common, Rare, Super Rare, and new rarities like Premier Territory. Key features include exclusive new illustrations, voice actor signatures on some cards, and unique "Equivalent Exchange" and "Action Point" card gimmicks from the anime. 
General contents
Packs per box: 16 booster packs
Cards per pack: 7 cards (for Vol. 2)
Total cards in box: 112 cards (16 packs x 7 cards/pack) 
Card types and rarities
Rarity levels: Common (C), Uncommon (U), Rare (R), Super Rare (SR), and new rarities such as Premier Territory (PT)
Alt-art and foil cards: Includes alternate art and foil versions of cards
Signed cards: Some high-rarity cards feature foil-stamped signatures from Japanese voice actors, including dialogue from the character
New illustrations: Features newly drawn illustrations for certain cards 
Special gimmicks
Equivalent Exchange: A unique gimmick in this set that allows players to reproduce elements from the Fullmetal Alchemist series within the Build Divide game.
Action Point (AP) cards: Includes special AP cards, with one rare gold version supposedly available in only one box per case. 
Characters featured
Vol. 1 & 2: The combined sets cover the entire anime, including characters from the beginning through to the final episode.
Vol. 2: Introduces characters who could not be included in Vol. 1, such as Briggs soldiers (Olivier, Buccaneer) and homunculi (Pride, Sloth), and the final boss "Father" in three forms. Other characters like Edward, Roy Mustang, and Envy are also present.