International Letter-post Items Regulations

5 (1) A letter-post item shall not exceed

• (a) in the case of a card or postcard, 235 mm in length and 120 mm in width; and

• (b) in any other case, 380 mm in length, 270 mm in width and 20 mm in thickness.

(2) A card or postcard shall be made of cardboard or any other material that is commonly used in printing and that is of sufficient grammage to provide the stiffness necessary for the card or postcard to withstand processing without difficulty.