Fate Dice: Centurion

Fate Dice: Centurion: - Rules of Play says:

This is a set of 12 x 16mm Fudge Dice.
It contains 3 sets of 4 Fudge Dice.
Each dice are marked with 2 faces with a "minus" (-) symbol; 2 faces with a "plus" (+) symbol and 2 faces blank.