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https://www.powerful-magnets.com/products/flat-neodymium-bar-magnets-with-adhesive-backing-40x12x1mm-n35-1.2kgs.html

The flat magnets with adhesive 40x12x1mm are glued with 3M self-adhesive backing. The thin characteristic make the self-adhesive backed neodymium bar magnets 40x12x1mm used in various application from hand-craft to daily use.