A Japanese "Ruler of the Black Flame" booster box for the Pokémon TCG contains 30 packs, with each pack holding 5 cards, for a total of 150 randomly selected cards per box. The set is from the Scarlet & Violet era and features powerful cards like Charizard ex, as well as Terastal ex Pokémon with new types and other rare cards such as special illustration rares and art rares. It's a sealed box intended for collectors and players who want to expand their collection with Japanese-language cards. 
Box contents and features
Booster packs: Each box includes 30 booster packs.
Cards per pack: Every pack contains 5 random cards.
Total cards: A sealed box contains 150 randomly selected cards.
Key Pokémon: The set is highlighted by the powerful Charizard ex, with other notable Pokémon including Tyranitar, Eiscue, Vespiquen, Dragonite ex, and Greedent ex.
Card types: The set introduces new mechanics and card rarities, such as Terastal ex cards, which have different types than usual, and other rare cards like art rares and special illustration rares.
Language: The cards are in Japanese.
Target audience: This is a sealed and collectible product for both Pokémon TCG collectors and players