Vol.4 or Volume 4 is a Japanese Booster Pack in the Yu-Gi-Oh! Official Card Game.
Like other cards printed early on in the game, the cards have no printed set numbers, and lack the distinctive Eye of Anubis Hologram in the lower right-hand corner of each card.
Of the 50 cards in Vol.4, 11 are unique to this set in the Japanese OCG, and all but six—"Tao the Chanter", "Water Girl", "Dokuroizo the Grim Reaper", "Fiend Reflection #1", "Barrel Lily" and "Kattapillar"—have since been printed in the Yu-Gi-Oh! Trading Card Game.
The set includes 50 cards, consisting of: