In traditional Mexican culture, the groom sometimes presents an ornate box with 13 gold coins to the bride, coins representing Jesus and his disciples as well as the groom's promised commitment to provide for his family. They're sometimes given to the groom by the padrinos, and they're blessed by the priest during the ceremony.

The word arras in Spanish means "earnest money" and the bride's acceptance of the coins symbolizes her trust in her soon-to-be husband to do so.