It can be used in industrial production and for personal creative design and daily use These magnets are resistant to corrosion, oxidation, and demagnetization and provide a smooth finished surface Great for DIY projects such as ammeter, instrument, electric motor, automatic control, microwave device, radar, and medical equipment Note: The magnets are very powerful, please be careful with your fingers or other body parts to avoid injury between the 2 magnets. Please handle it carefully. Strong magnets are made from rare earth at high temperatures and cannot be guaranteed to be 100% perfect. Small flaws do not affect its performance and use. Magnets should be kept away from iron and some easily magnetized iron products, such as monitors, bank cards, computers, TVs and mobile phones. It is forbidden for children under the age of 8 to touch and use, and prevents children from swallowing. Specification: Shape: round Material: NdFeB Maximum operating temperature: 80C/176F Tolerance: about 0-0.5mm Electroplating workmanship: nickel + copper + nickel three-layer plating Package included: 100Pcs x NdFeB Magnet Other items not included