Material Grade：N52。. Magnets are fragile, sintered from neodymium iron boron powder, hard and brittle, fragile is not a quality problem, need to be placed at room temperature storage。. -Dia:3.5mm 4.5mm 5mm 5.5mm 6mm 6.5mm 7mm 8mm 9mm 10mm 12mm 14mm 15mm 16mm 18mm 20mm 23mm 31mm 35mm 40mm 47mm 48mm 。.
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