But what they all have in common is that they are made of pure metal with a nickel surface

Additionally

Very large block-shaped ferrite magnet with magnet direction on the large surfaces (axially)

160 grams for each cm2

BNT Kontormagnet, Sort Ø20 mm. (8-pak) julepynt But what they all haveBlack office magnets from BNT office. Cheap board magnets for holding 1 2 pieces of A4 paper on a magnetic whiteboard. Strength: approx. 200 g. Diameter: 2 cm. Color: Black Package: 8 pcs. Use these small magnets when you just need a magnet for simple use on your magnetic board. A strength of 0. 2 kg. is standard for office magnets. But if you need a stronger magnet, just choose a larger size magnet. The purpose of these magnets is a inexpensive