The 6 Kinds of Harmful Insects (D 425) is a classified materials set for Lower Elementary science, providing representations and supporting nomenclature for insects that pose risks to agriculture, ecosystems, or human health. It pairs naturally with its companion set, D 424, to give students a comparative framework for understanding insect roles in the natural world. Teachers working through zoology or life science studies will find this set supports the Great Lesson on life and extends into research work on ecology and food chains.