These espresso-roasted beans were roasted less than two hours before the picture was taken. In my experience freshly-roasted beans are glossy from oils, I assume.
I just took a pair of calipers to some of beans from the bag this picture was taken of. They measure approximately 0.45"×0.33"×0.20" along the long way, the short way on the flat side, and normal to the flat side.
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