This 2-pack of handy magnetic utility clips are strong enough to keep those important lists memos and letters from sliding out of sight. A must for every studio school office and home. For use around the shop home or office. Avoid the frustration of weaker magnets. * * 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 & alternators lifting magnets brakes clamps switches & relays sweeper magnets science projects toys games motors magnetic couplings POP displays advertising giveaways promotional items novelties & much more.