The magnets are made of colored plastic with a strong ferrite magnet at the bottom

But since they are not acid-free

The magnet can capture everything from objects made of metal to real magnets

heavy fabrication and woodworking

You cannot use magnetic foil on glass boards

Magnetkroge sølv, 4-pak - køleskabsmagneter BF Tier1 The magnets are made ofBox with 4 magnetic hooks in metal for the fridge. Use these silver colored magnetic hooks for hand towels etc. The back is covered with an anti slip silicone cap. The strength in direct pull is approx. 1. 5 kg. but you will need this strength to keep a towel hanging on your refridgerator, as the downward pull of the towel is tough on magnets. Strength: approx. 0. 5 kgs. in downward pull. Brand: Trendform MM4615 Color: Metal (silver). Size: 3. 5 cm.