Click to expand Tap to zoom WS That Time I Got Reincarnated as a Slime Booster Box (20 packs) [Pre-order] by Bushiroad Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% £80.00 | / SKU BUSWSETSKS70BP 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart WS That Time I Got Reincarnated as a Slime Booster Box (20 packs) - Rules of Play says: Each booster pack contains 8 cards.