The product is a set of textbooks by TOPS Learning Systems focusing on magnetism and metric measuring. Authored by Ron Marson, the textbooks are recommended for grades 3-10. The format is paperback, and the publication names are TOPS Learning Systems #33 Magnetism #35 Metric Measuring #36 More Metrics These textbooks provide educational resources for students and learners interested in understanding magnetism and metric measuring concepts. These books have never been used, but show some discoloration in places from sitting on my bookshelf. We did use several other books in this series over the years, finding them enjoyable and helpful.