Specifications: Featuring cuboid shape, hard texture, stable performance. Application is extremely wide. Usage: Acoustic field: the speaker, receiver, microphone, alarm, stage audio, car audio and so on. Electronics: permanent magnetic actuator vacuum circuit breakers, magnetic relays, meter, sound meter, a reed switch, sensors. Electrical field: VCM, CD/DVD-ROM, generators, motors, servo motors, micro-motors,motors, vibration motors. Machinery and equipment: magnetic separation, magnetic crane, magnetic machinery. Health care: MRI scanners, medical equipment, magnetic health products and so on. Type: Magnet Material: NdFeB Quantity: 20Pcs Grade: N52 Magnetized Direction: at Both Ends of the N S Pole Features: Cuboid Shape, Super Strong Magnetism, Multipurpose Size: 10mm x 5mm x 2mm/0.39" x 0.20" x 0.08" (Approx.) Notes: Please place it to where children cant find, in case of eating wrongly. Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 20 x Magnets