From the publisher's website:
Fudge dice are six-sided dice with two "plus" sides, two "minus" sides, and two blank sides, for use with Fudge and other games. Rolling four Fudge dice returns results from -4 to +4 ("sub-Terrible" to "trans-Superb" in Fudge terms). Fudge Dice come in packages of 20 dice in five colors, in clamshell packaging.
Includes a "Welcome to Fudge Dice" document with Fudge dice statistics and tips on using the dice for Fudge and other games.