Flywheel ferrite (magnets) ONAN 6 pieces makes 5-3/4"- 6" circle non-magnetic.

Description

You will need to get these magnetized.   I am not sure how that is done but you may want to call an electric motor repair shop.  They may be able to do that for you.
This came from the Onan factory in cases. They are not magnetic.  All bulk ferrite is sold this way.
ONAN PART NUMBER 191-1347
Flywheel ferrite ONAN with rounded corners
6 pieces .each pc is 2-7/8" x 7/8"×1/4" thick
makes 5-3/4" to 6" circle non-magnetic. NOS
THERE MAY BE A MINOR FLAKED OFF EDGE HERE AND THERE
This came from the Onan factory in cases.
These are not magnetic.
All bulk ferrite is sold this way.
...
Mike
11-3-21