The product is a set of 10-19 hardcover volumes of the Britannica Macropaedia Knowledge in Depth, published by Encyclopædia Britannica, Inc in 1989. This luxury edition reference set, authored by the University of Chicago, provides in-depth knowledge on a wide range of subjects suitable for personal or institutional use. The original print language is English, making it a valuable addition to any collection focused on encyclopedias and reference materials.