Ring Ø27.0 x Ø21.0 x 3.0 mm N38 Nickel (Ni+Cu+Ni) Neodymium Magnet

Type: Permanent  Composite: NdFeB Magnet  Shape: ring shaped 
Application: Speaker Magnet  Material: NdFeB  Shape: Ring 
Grade: N30-42  Size: Custom  Coating: Zinc coating 
Color: White  Sample leadtime: 3-5 days  Tolerance: 0.05-0.1mm 
Application: Speaker, clothes  Certificate: QS-9000 
oduct Name: n52 big ring neodymium magnet for speakers
 ISO/TS 16949 & ISO14001 & &QC080000 Certified.
Features:
1) ?3 up to 220mm
2) Up to N52 max.
3) Ni, Zn, NiCuNi, Gold, or Epoxy coated.
4) Max. Working Tempeture: 250 deg. C
5) Used in audio equipment, such as Loudspeakers, earphones, microphones,etc.