As a science teacher i was impressed by the Raw Pyrite Mineral Specimen for CLASSROOMS .The specimens were great tools to use during lessons and hands-on experiments. They were durable, and the size was perfect for my students to examine the finer details. As a result of using this product, I found that my students were more engaged and gained a deeper understanding of industrial and scientific concepts. The only downside was that there were only a limited number of specimens in the set, and I wish there were more..