... 4.Good corrosion-resistance &nice surface Black Bonded NdFeB Magnet Material:Quick-quenched NdFeB magnetic powder with bonding agent.Grade ... widely used in stepping motor, CD-ROM spindle motor, general motor, vibrating motor, pick-up, HDD spindle motor, and FDD spindle motor.2. The injection ... , are widely used in electric expansion valve, air-condition motor etc,. Black Bonded NdFeB Magnet