The dice are mis-spots. The numbers you see are the numbers on the six sides. There are two different sets. These are passers, when used correctly, they will not seven out. After the mechanic achieves his goal, he can muck a die in from the other set and end the hand if he chooses. If not it becomes a bust out and everyone runs out of money except the cheater. The other outcome is someone catches it, and the real fun begins. Pretty much amateur stuff used in muscle games. Real pro's use percentage dice. Harder to catch and you don't bust out the game. (I read about this stuff when I was younger)

What are percentage dice? Weighted or shaved?