Feature:Magnets can be generating a magnetic field an object， can attract ferromagnetic substances such as iron， nickel， cobalt and other metalsMagnetic pole judged by a thread hanging Magnets， pointing to the north pole is called North Pole， pointing to the south pole as a S poleMagnet pole is different attraction， with pole the exclusion NdFeB (Neodymium magnet) with a high magnetic energyHard texture， stable performance， very good priceApplication is extremely broadSurface coatingDetail:Shape:BlockMaterial:NdFeBGrade: N50Color:SilverQuantity: 20pcSize:30×10×3mm (Length * Wide * Hight)Applications:1) Acoustic field: the speaker， receiver， microphone， alarm， stage audio， car audio and so on.2) Electronics: permanent magnetic actuator vacuum circuit breakers， magnetic relays， meter， meter， sound meter， a reed switch， sensors.3) Electrical field: VCM， CD / DVD-ROM， generators， motors， servo motors， micro-motors， motors， vibration motors.4) Machinery and equipment: magnetic separation， magnetic crane， magnetic machinery.5) Healthcare: MRI scanners， medical equipment， magnetic health products and so on.6) Wedding corsage badges， etc.， can be replaced with a magnet attractsevery other clothes pins， so as not to damage the dress.7) For the overlying metal drawing board for fixing the drawing paper. Magnetic blackboard whiteboard fixed file drawings.8) Advertising magnets available to replace the original fixtures， at any timeconvenient to replace the ad content.9) Models piling， you can use small magnets to connect two widgets.10) Other industries: magnetized Wax， pipe descaling， magnetic fixture， automatic mahjong machine， magnetic locks， doors and windows magnetic， magnetic luggage， leather magnetic toys， magnetic tools， gifts and packaging.WARNING!!!Strong magnets should Keep away from Ironware and some easily magnetized iron products， such as monitors， bank cards， computers， televisions， mobile phones and otherMagnets might affect water meter ，electric meter， gas meter and some metering equipment exist some inaccurate affect (Such as : if magnets placed near the meter， the meter will slow down)These magnets are very powerful which should be handled with great care. Without parents supervised do not allow children to playing magnets as they could get injured. Especially pay attention to the small magnets ， please place in somewhere children can't reach place.Notice: The Seller will not be held liable for any damage or injury caused by these magnets.Package Include:20X Block Magnets