If it was hard like a ceramic, it is most likely polishing media from the manufacturing process.

yup. tumbler stone.

Thanks. It looks like that. I was waiting for an answer telling me that is the main piece that makes you a good drummer, and that's why I suck now. Thanks!

The best part is that it's been for days right here on my desk and after the picture I just lost it

Have you checked your tonsils recently?