1)Composite:Nedymium-iron-boron
2)Size:OD66.4*ID58*5 mm 
3)High quality consistentcy, Low weight loss

1)About Rare earth Ring  magnet

•Grades:N30, N33, N35, N38, N40, N42, N45, N48, N50, N52, (M, H, SH, EH, UH )
•Coatings: Ni, Ni-Cu-Ni, Zn, white-blue Zn, Expoy, Gold, Parylene, Ni-Cu-Sn.
•Sizes: OD66.4*ID58*5 mm 

•Shapes: Ring 

•Tolerance: +/-0.05mm for small dimensions, +/-0.1mm for common specifications, +/-0.15mm for big Rings 
•High magnetic performance(Br: 11, 000 to 14, 500 Gs, Hci: 11, 000 to 30, 000 Oe, BHmax: 35 to 50MGOe )
•Maximum working temperature: 80 to 200 degrees C.

Applicantions of the Neodymium magnets (NdFeB Magnets)

Generators, servo motors.DC motors.Computer rigid disc. Wind turbines printers.

Loudspeakers. Annunciators, linear, linear, actuators. Microphone assemblies.

Magnetic separators. Automatic mahjong machine.etc.