4PCS Large Ferrite Ring Magnet – Grade 10 Big Magnets Heavy Duty, OD60mm x ID32m
【Durability and Stability】 Ferrite Round Magnets have High resistance to demagnetization, corrosion and oxidation. It can exists forver under 180°Temperature. 【Multiple Uses】These Big round magnets are widely used as classroom magnets, refrigerator magnets, industrial magnets, whiteboard magnets, motors and generators, sensors, speaker magnets, scientific magnets and DIY magnets.