With a Thump on top, those micros are a ridiculous tiny setup!Oh yeah, it's tiny, it's as absolutely small as humanly possible to make an 18650s and a 8.5(or 6ml, they are the same diameter) bottle. It's about 0.5in taller than an 18650 B.C. The threads in the 510 are 0.5in (that's how long they have to be for an atty) so that's how thick the cap is...and it hits just as hard as the 10ml, they are built the same way but the 10ml bottle actually holds like 14ml.
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