The neodymium disc magnet is in the group or rare earth magnets which is the stongest type of permanent magnet available today.
The magnet is grade N42, with N standing for neodymium and 42 referring to magnetic strength. Neodymium grades are from N35 to N52, with N42 considered one of the stronger grades. One magnet source estimates the pull force of this block magnet at approx. 23 lbs. As measured with the magnet placed on a steel plate.
Caution with use…
• Keep away from electronic devices. Strong magnetic fields could damage these devices.
• These magnets are brittle. They can be broken or chipped in colliding.