oil filter inspection

[jrh68]

What is acceptable/normal to find in an oil filter? Obviously you don't want to find bearing material.

The oil filter below has about 1k miles and 30 passes. This is the second oil change since the motor got new rings and bearings.
I'm not looking for any particular problem,but have just gotten into the habit of looking inside the filter when I change the oil.

[PeteCleary]

My non-expert take is you might expect to see some fine material from the rings/cyl walls as they seat. I wouldn't expect any copper particles.