Permanent magnets can be used anywhere as long as you need it.
They have super strong magnetic force. And this force can be stay very long.

Material:	Sintered Neodymium Iron Boron Magnet
Grade:	N35
Max. Operating Temperature:	＜ 80 ° C
Size:	D5x5mm
Tolerance:	±0.05mm
Coating:	Ni-Cu-Ni plated
Magnetization:	magnetized
Magnetized direction:	magnetizing through thickness with N & S poles at the two plat sides
Net Weight:	0.74g

China Magnets Source Material Limited provides customized service and produces various sizes and small MOQ is possible.