5*5 MM 10/50/100 PCS Neodymium Magnet Small Strong Round Permanent Electromagnet NdFeB Magnetic DISC
https://www.vogueparade.com/shopping/EN/42/1/1005003638515214/55-mm-1050100-pcs-neodymium-magnet-small-strong-round-permanent-electromagnet-ndfeb-magnetic-disc//