Goods sent to non EEC countries that are not black and white printed material need a pro forma to be sent with the item. The value you show will be the figure used by customs to work out any import duty that may have to be paid by the person you are sending the goods to. You should supply 4 pro-formas, printed on company letterhead paper, with each shipment even if the goods have no value you will still need to provide a pro-forma and include NCV(NO Commercial Value) in the total value field