Buy 20mm diameter, thickness of 6mm round magnet, you can look at this, the material is ceramic ferrite, has a high cost-effective, high temperature and corrosion resistance, suitable for toys, office supplies, personal DIY, handicrafts, door sucker, when you buy need to make clear that they need is the same sex or the various anisotropic, the anisotropic magnetism is stronger.
Special Note: We are a magnet manufacturer, so the size, performance and special processing requirements you need can be met, please send an inquiry for details.
Might be a better fit for your size;
20mm x 10mm Thick Y30 Ceramic Circle Disc Magnet Pull 1kg