Rare-Earth Spherical and Hemispherical Magnets - Lee Valley Tools
Gold Colored Spherical Magnets Assorted
NeoMagNova® Neodymium Magnet Extra Strong - N45, 10 mm Anti-Stress Magnetic Balls - Ball Magnets for Relaxing, Concentrating, Experimenting and Crafts - Set of 10 : Amazon.de: Stationery & Office Supplies
Do spherical magnets attract each other or repel? - Quora