6mm x 4mm x 2mm Block - Neodymium Magnet: Amazon.com: Industrial & Scientific
Amazon.com: MEALOS Magnets - 150 Tiny Magnets Mini Magnets Small Round Magnets for Crafts - 5mmx2mm Magnets for Miniatures Small Models - Come with a Storage Case : Home & Kitchen
Amazon.com: 4mm x 2mm magnets
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Magnets for Crafts - 100 High Quality 1 inch Round Strong Magnets – 25mm x 4mm - Great for Creating Fridge Magnets and Other Magnetic Craft Projects: Amazon.com: Industrial & Scientific
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Magnet Expert® 4mm dia x 3mm thick N42 Neodymium Magnet - 0.54kg Pull (Pack of 20) : Amazon.co.uk: DIY & Tools
Amazon.com: 4mm x 2mm magnets
Amazon.com: D 12mm x H 3mm with 4mm Hole 20 Pieces per Pack. Round Magnets for Refrigertor Magnets, Magnet,Office Magnets,Art&Craft Magnets,Whiteboard Magnets,Map Magnets,Durable Mini Magnets for Multi-Use : Industrial & Scientific