The product is a softcover book titled "How to Use Trig Slide Rules" by Maurice Hartung, published in 1960. It is a guide to using slide rules for trigonometric calculations. Manufactured by Pickett, a well-known maker of slide rules in the United States, this book is a valuable collectible for those interested in engineering and mathematics. With free US shipping included, it offers a convenient way for enthusiasts to learn and practice using slide rules for various mathematical applications.