Penny Knife is about building a historic springless folder from the colonial era. These inexpensive folders were popular then and the story goes they were named because they cost a penny back then. Just learning how to make the sheet metal bolster tight is worth the price of the booklet. Penny knife is very popular with reenactors concerned with authenticity. 19 pages, 8 1/2" X 11", $6.00 plus shipping.