What size washers are allowed in the washer game?

Excuse me, could you clarify what you mean by the "washer game"? Is it a specific type of game that involves physical washers, or perhaps a metaphor for some sort of financial or cryptocurrency activity? Assuming we're talking about a game with physical washers, the size allowed would likely depend on the rules of the game and the size of the game pieces or spaces they're intended to fit into. Could you provide more context or details about the game in question?