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BeaconJon
@Lukas
If you ordered them through eBay, from a particular supplier (can't remember the name), you may want to check that the balls inside are actually ceramic (pry-off the seal with a scalpel blade).
If the balls are silver and shiny (and not grey/black, or possibly white), you've been 'done'.
I only mention as I purchased four, not at the same time, and one was suspiciously light in weight compared to the others, which turned out to be the only ceramic one, despite me having shelled out for four.
Unfortunately I had them sat in my parts drawer for over a month before I realised, and I'd already left feedback (when they arrived), so CBA raising a dispute with the seller.
Otherwise, GLWS!