Using as health treatment?
Beware that the open pole has the right polarisation. It has to have north pole wich in reality is magnetic south pole.
With wrong polarisation you degrade your health. Magnetic north pole is used to reduce pain only and temorarily only.
Bye the way, LONG magnets have larger magnetic fields than small powerful ones
Finally you don't need high power magnets. In bio magnetics and elektromagnetics weaker fields are more effectiv, better than strong fields
Check out: https://www.kleinsche-fields.blog/de/