Amazon.com: 5mm Round Magnets. 1-16 of 472 results for "5mm round magnets" Results. Check each product page for other buying options. Price and other details may vary based on product size and color. 100Pcs Small Magnets, 5x2 mm Mini Tiny Round Magnets, Micro Neodymium Magnets for Crafts, Miniatures, Refrigerator, Whiteboard, Nail Cutter. 800.