The strength weakens the further the magnet is from the magnetic surface

You just need a good pair of scissors

where you erase like a blackboard - just be aware that dark board markers can leave shadows

Package of 4 white magnets with different happy quotes:

Cheap board magnets for office and home use with a strength equivalent to approx

Power magnet, Stav 4x12 mm. engros The strength weakens the furtherNeodymium magnets Power magnets NdFeB Diameter: 0. 4 cm Length: 1. 25 cm Strength: approx. 0. 56 kg. A magnetic rod is magnetic at both ends. Therefore, it's easier to pick up than a flat magnet. This size is not suitable for magnetic glass boards (chat boards). SPECIFICATIONS: Strength: approx. 560 gr. Material: NdFeB Magnetisation: N42 Max. temperaturee: 80C Surface: nickel plated (Ni Cu Ni)