With Holes : NoApplication : Industrial MagnetComposite : NdFeB MagnetModel Number : imanesShape : BlockType : PermanentOrigin : Mainland ChinaCertification : NONEType: MagnetMaterial: NdFeBSize: 4x4x3mmFeatures: Round Disc, Super Strong Magnetism, MultipurposeStandard tolerance: 0.3mmNotes:A Neodymium magnet also known as NdFeB are the most widely used type of rare earth magnet.Please note that by their very nature, neodymium magnets are brittle and do break easily if not handled carefully. Please take care when using.WARNINGS:Do not swallow, Please keep away from small children and babiesKeep magnets away from electronic devices and magnetics strips as they will wipe information from the device.Please place it to where children can't find, in case of eating wrongly.Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Specifications:hard texture, stable performance, very good price.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.Healthcare: MRI scanners, medical equipment, magnetic health products and so on.Wedding corsage badges, etc., can be replaced with a magnet attracts every other clothes pins, so as not to damage the dress. For the overlying metal drawing board for fixing the drawing paper. Magnetic blackboard whiteboard fixed file drawings.Advertising magnets available to replace the original fixtures, at any time convenient to replace the ad content.Models piling, you can use small magnets to connect two widgets.Studio, bulk magnet can be used to adsorb screws and other parts, even wrenches and other tools.