This 51-pack of round shaped ceramic discs is perfect for do-it-yourself projects and making your own magnets. Glue to the back of any light to medium weight item and place on refrigerators, lockers, white boards or any ferrous metal surface. Perfect for home, school and office. More About Ceramic Magnets - Our hard ceramic ferrite magnets are composed of iron oxide and barium or strontium carbonate. Ceramic magnets exhibit relatively good holding strength for their price, making them a popular choice for many consumer, commercial and technical applications. Ceramic magnets have so many practical uses including, craft projects, refrigerator magnets, badge holders, latches, display boards, loudspeakers, security systems, motors, generators and alternators, lifting magnets, brakes, clamps, switches and relays, sweeper magnets, science projects, toys, games, motors, magnetic couplings, POP displays, advertising giveaways, promotional items, novelties and much more.