From the publisher:
We refuse to write a complex description for dice. These are 6-siders, and there are six in the package. They match the pawns in the +6 Bag o' Munchkins and +6 Bag o' Munchkin Babes, and the dice in Munchkin Quest. They also match pretty rainbows. They have the Munchkin head in place of the 1. Buy them. Kill monsters and take their stuff.