Notice: Strong magnetic they are、 so mind your hands avoiding being clamped、 preserve it under room temperature. Application range: speaker、 receiver、 microphone、 alarm、 stage audio、 car audio; Vacuum circuit breaker、 magnetic latching relay、 electricity meter、 watt hour meter、 water meter、 sound meter device、 reed switch、 sensors; VCM、 CD/DVD ROM、 generator、 motor、 servo motor、 micro motor、 motor、 vibration motor; Magnetic separation、 magnetic separator、 magnetic crane、 magnetic machinery; Nuclear magnetic resonance instrument、 medical equipment、 magnetic therapy health care products、 magnetizing economizer; Magnetized paraffin device、 pipe cleaner、 magnetic holding device、 automatic mahjong machine、 magnetic locks、 door / case / toy / tool magnet、 leather bags magnet、 craft gift packaging. Dimensions: 0.47 in x 0.47 in x 0.16 in (1.2 cm x 1.2 cm x 0.4 cm) Weight: 5.57 oz (158 g)