what size is a regular playing card
Your customer is right. Playing cards come in two sizes-poker size and bridge size. Poker size is 63.5mm X 88.9mm. Bridge size is narrower at 56mm x 88.9mm. This makes more sense in old fashioned imperial measurements-both are 3.5 inches high, but poker cards are 2.5 inches wide while bridge cards are 2.25 inches wide.