This document contains summaries of three Damascus steel knives: a butterfly knife, a neck knife, and a Bowie knife. The butterfly knife summary describes its origins in 17th century France and the Philippines and notes that its quick blade display makes it suited for use as a weapon. The neck knife summary explains that it is typically worn around the neck for utility cutting but can also be used for self-defense, though some states prohibit concealed carry. The Bowie knife summary does not provide any additional details.