The Japanese One Piece Booster Box OP-02, titled "PARAMOUNT WAR," contains 24 packs with 6 cards per pack, focusing on characters and events from the Paramount War arc. It features 121 total card types, including 8 leader cards, and has a higher concentration of rare cards, with rarities like Super Rare and Secret Rare, making it highly sought after by collectors and players for both powerful cards and desirable singles. The set also introduced new strategies with the addition of "Black" colored cards and enhanced existing decks. 
Box contents and features
Theme: The set revolves around the Paramount War arc, featuring characters like the Whitebeard Pirates, the Three Admirals, and Ivankov.
Packs: Each booster box contains 24 packs.
Cards per pack: Each pack contains 6 cards.
Total cards in box: Each box contains a total of 144 cards.
Total card types: There are 121 total card types in the set.
Rarities: The set includes a variety of rarities:
Leader: 8
Common: 45
Uncommon: 30
Rare: 26
Super Rare: 10
Secret Rare: 2
Other features:
Includes alternative art and parallel design cards.
Introduced new "Black" colored cards and new multi-colored leaders, such as a Red/Black Garp.
Japanese version, made in Japan.
Includes a "Box Topper" card with each box.