3mm dia x 2mm thick N42 Neodymium Magnet - 0.25kg Pull
Disc magnet 6 x 3 mm, Nickel-plated - supermagnete.de
Amazon.com: 40pcs 6*3mm Small Magnets for Crafts - MEALOS Mini Magnets Tiny Magnets - Little Button Magnets Micro Magnets - Round Fridge Magnets Also for Miniatures, Model Making, Crafts and 3D Printed
GoolRC 1000Pcs 3mm Magnetic Ball Set Magnet Cube Building Toy for Stress Mix 10-Color - Walmart.com
REALTH Disc Magnets Diameter 12mm x 3mm Neodymium Small Rare Earth Magnetic Round Magnet for Fridge Office Science Project Teaching and Craft 10 Pack(MC1210): Amazon.com: Industrial & Scientific