Whiteboard magnets – strong and robustYour PYJLBX strong magnet are extremely robust in their shape and size. All PYJLBX magnets for crafts are manufactured using a complex anisotropic process, our small magnets for crafts have a strong resistance to demagnetization, corrosion and oxidation resistance, which makes them the most practical funny magnets on the market. Magnets for fridge rustproof.