Product Description Polished Black Colorful Ferrite Small Round Square Magnet Fridge Magnetic Toy Specification: 100% Brand new and high quality. Material:Ferrite permanent magnet Color:Black, Color Net weight: 285g/box Conversion: 1cm=0.39inch, 1inch=2.54cm Feature: Coercivity: 150 (KA/m) Residual magnetism: 0.21-0.23 (T) Endowed coercivity: 240-350 (KA/m) Maximum magnetic energy product: 9.0-9.5 (KJ/m3) Density: 4.8 (g/cm3) Working temperature: -20-200 (℃) Curie temperature: 530 (℃) 1.Acoustic