The perfect way to announce the arrival of your new little ones... These are a great compliment to our baby milestone month sets! These signs are made from unfinished 1/8" baltic birch wood. They measure 7" in size. These can be written on directly with a pen or pencil. We recommend to try your writing utensil on the reverse side to see how the wood takes the ink first. Permanent markers tend to spread a little, but are worth trying first!