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The Double Dice (formerly known as a Double Dice Block) is a special Dice Block that appears in Mario Party 10. As the name suggests, the player is allowed to roll two Dice Blocks. The effect is similar to the Mushroom Orb, Twice Candy and Double Dice Set from past games.
The Double Dice Block can appear if the player stops on a Special Dice Block Space.
The Double Dice Block returns in Mario Party: Star Rush and Mario Party: The Top 100, functioning the same as before. In Toad Scramble, the two Dice Blocks used are that for the current leader (i.e, If Toadette is the leader, then two Cutie Dice Blocks are rolled). This item is the default item for amiibo characters if they do not have Mario Party 10 data saved on them.
Official description from Mario Party: The Top 100
What's better than rolling? Rolling two dice at once!