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I have some hard drive rails from a SAN. The seem to be about the same density as steal. They are not magnetic at all. I have tried a hard drive magnet and there seems to be no attraction at all.

Could they be stainless? The reason I question is all the other stainless I have dealt with has at least a minor attraction with the magnet.

I attached a picture.

Does anyone have any clues? Anything I should check? I have 50+ of them.

My first guess was a high density metallic polymer plastic.
This one is actually interesting for reasons beyond what it could be
We have a made in China stamp
A made in the USA label
And a Japanese recycling sticker
:facepalm:

So let’s break this down since the normal methods won’t work.
You did the most important— magnet test.
Moving on.
Drop it from 3 or 4 feet. Preferably onto concrete.
A thud with no reverb is a plastic
A clang is aluminium
A thump is magnesium or manganese. The 2 Ms.
I can’t rule it out from a photo but I’m not thinking Al here because no matter how it’s manufactured Al always produces “lines”. I’m not seeing it here.

My thought Is either a very dense plastic or manganese.
If you want to know for sure, and you have a vice you can lock it in and hit one of the sides with a hammer to crack or break it. The inside section would tell me instantly in most cases.

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I didn't recognize the Japan sticker but noted the Made in China and USA bit.

I'll do a drop test.

It's pretty dense. Feels like steal to me based on density.

I'll try breaking one and try a file on one too.