Pebbles Lullaby Baby Gender Reveal Party Scratch Off Cards. At a reveal party, ask guests to mark their guess at the bottom of the card. Then let them scratch-off the gold sticker to see if they guessed correctly! Place a blue or pink sticker on the card based on the baby's gender; and place the gold scratch-off sticker over the pink or blue sticker. Includes twelve cards, twelve scratch-off stickers, twelve blue stickers, twelve pink stickers and instructions. Acid free. Imported.