I suggest you put paper money. After all, the face value of paper money can completely replace coins, and there is no need to innovate. Then let the newcomer respond.

The amount of gift money should please the lottery players as much as possible, and it is best to be in pairs, such as 666 and 888. "Three" homophonic "San". Birthday wedding taboo, birthday gift is also taboo. "Four" is homophonic with "death", and this number should not be used for wedding gifts. The homonym of "five" is "nothing", which is taboo in some places, and there is a saying that "there is no child or daughter". In some places, women are afraid of the number "seven", which stems from the fact that ancient women will be punished if they commit seven deadly sins. Also note that in some places "8" is not used for marriage, because it is two "4".

See/wiki//wiki /wiki/bentry_96.html for details of wedding red envelopes.