OK so I've did a search here to see if this has been discussed,to no avail. I was separating hard drives cases today. It's pretty simple. Aluminum,non magnetic stainless, Magnetic stainless. Then I ran into this one. Non magnetic and no spark from the grinder. At first I almost threw it into the aluminum pile but I noticed it was significantly heavier and then there was a yellow underneath the layer I took the grinder to. Has anyone ran into this and would it be brass? I wouldn't think they would use brass but this one has me stumped. Thanks in advance.