This is the perfect kit for home schooling, science fair, elementary science, and in classroom demonstrations. This isotropic ferrite magnets kit is designed for kids, perfect training tools for science class, help teachers/parents who wants their kids learn more about science/magnetic. And it will attract children's attention obviously. Contents: bar magnet: 2 Pieces 3.85 inch length; u-shape: 1 Pieces 2.36inch length; ring ceramic magnet: 2 Pieces, 1.26inch dia (with a pencil you can do magnetic suspension experiment); compass (plastic material): 1 Pieces; some disc iron sheet. Caution: magnets are brittle please be don't cast.