I have many wheat pennies that I have found throughout my life. I have sleeved only a couple of my older wheat pennies and a couple of my cleaner coins. The rest, at the moment, are in a tube until I can find time to sleeve the rest.
Due to the demand for copper during World War II pennies struck in 1943 are made with steel and coated with a thin layer of zinc. I have far too many of these to sleeve at the moment and not nearly enough sleeves. A majority of them are in two penny books and the rest in a tube.