My test procedure for this is to put them in the freezer for a few minutes. Since metal cools down much faster than plastic, they're easy to tell apart. But of course that's strictly amateur, nothing fancy like licking or heated needles. 
Head-Fi.org › Forums › Equipment Forums › Portable Headphones, Earphones and In-Ear Monitors › [REVIEW] Feels Pro 900
[REVIEW] Feels Pro 900 - Page 3
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