Cutequeen 100PCS Round Ceramic Industrial Ferrite Magnets for hobbies,Crafts,Science and Refrigerator magnet Get CPSIA Certification it is Ferrite Magnets,not strong magnets,Grade 5, It is highly stablility udner difficultal environment;Widely used for refrigerator magnets,office magnets,perfect for magnetic push pins, map magnets and whiteboard magnet etc. notice:It is only for science,craft and production use,Not toys. 30 days Unconditional refund.