In the film "Paper Moon", which product do Ryan and Tatum O'Neal pretend to sell to scam customers?

"Paper Moon", a 1973 American road comedy-drama film, was directed by Peter Bogdanovich and released by Paramount Pictures. It was produced by Frank Marshall and Peter Bogdanovich. Film screenwriter Alvin Sargent adapted the script from the 1971 novel "Addie Pray" by Joe David Brown. The film was shot in black and white and set in Kansas and Missouri during the Great Depression. It stars the real-life father and daughter pairing of Ryan and Tatum O'Neal as protagonists Moze and Addie. Tatum received widespread praise from critics for her performance as Addie, earning her the Academy Award for Best Supporting Actress.

In the storyline, Moses "Moze" visits recently widowed women, pretending to have previously sold expensive, personalized Bibles to their deceased husbands. The widows pay him for the Bibles inscribed with their names. Addie joins the scam, pretending she is his daughter. She exhibits a real talent for confidence tricks, such as selling Bibles and the quick change scam. As time passes, Moses and Addie become a very formidable team.