One block of acidic ooze. Four dry-erase boards. This keepsake box is designed to resemble the iconic gelatinous cube from Dungeons & Dragons and contains four foldable dry-erase boards for sketching maps, terrain, and more. Each board measures 12.75 × 8.5 inches unfolded.

Each board is double-sided, with a 1-inch square grid on one side and a 1-inch hexagonal grid on the other. The displayable box can also hold dice, pencils, pens, markers, or other accessories. Dry-erase markers are not included.