Our single-sided "Hello World" sign is the perfect prop for your newborn birth announcement photographs! One side of the sign is laser engraved and the other side is blank. You can use a permanent marker to fill in your baby's measurements. The sign measures 5" wide and is laser engraved on 1/8" thick Baltic Birch Plywood. Each sign may vary slightly in color and grain due to the material being made from natural wood.