7-sided DICE

I didn't try yet if these 7-sided dice (D7) are completely fair.
The size and shape of faces 6 and 7 are different from the others.


A great 'ball roller' with the possibilities
1, 2, 3, 4, 5, 6, and Grolsch (a Dutch beer brand).


And this special die (called Y2K die) consisting of two D4's which can turn independently.
Each D4 has 0, 1, 2 and 3 pips so that one can throw a 0, 1, 2, 3, 4, 5, or 6
therefore, in fact, resulting in a D7.