permanent markers cannot be erased easily

Strength: 0

Or as MagSwitch itself says: the ultimate compact lifting magnet

they must be put on the magnetic surface with care - hold onto the entire magnet and not just the edge

Power magnet, Skive 20x20 mm. Tier1 permanent markers cannot be erasedStrong magnet of neodym with a straight pull of approx. 15 kg. Diameter: 2 cm. Height: 2 cm. Strength: approx. 15 kg. An incredible strength of 15 kg. which means that the magnet can carry its own weight more than 300 times. Powerful magnets are not toy and they can be difficult to seperate. (Just slide the magnets in opposite directions, possibly by use of the edge of a table) SPECIFICATIONS: Strength: approx. 15,000 g. Material: NdFeB Magnetisation: