Magnetic bookmark, it doesn't fall off the book easily. Also it's hard to lose. Even if you stick it in several parts of the book, it doesn't move much when you flip through the book. The materials used are paper and magnets.The paper can really full back of magnets, so no problem with long use.
Also,any customized package,size,designs...Just let us know your ideas,we are always here try to make it prefect.
Magnetic force can be customized too,Normally,from 0.4~1MM isotropic rubber magnet,But also anisotropic magnet available