... 4.best price 5.timelu delivery counterbored/countersunk ring NdFeB magnet Ring NdFeB magnet1.Material of NdFeB magnet:Magnet N-( ... , any coating as you like.3.Magnet shape: Block,Ring, Arc,Disc, Cylinder, Rod,Bar, Cube,Sphere,Strip ... are widely used in communication, electronics, household appliances, medical apparatus many industrial area, like speakers, headphone, mobilephone, receiver, microphone ...