Amazon.com: Four Brothers Magnetic Hematite Balls for Stress and Anxiety Relief - Sphere Magnets for Fun and Scientific and Developmental Learning - Magnetic Hematite Zinger (25mm) : Toys & Games
Sigel Sphere Magnets for Magnetic Glass Boards, 3-Pack - Bindertek
Super Strong N42 Neodymium Sphere Magnet 1.26 inch Diameter