i just measured mine tonite they came out at 16.5 flexed...(not pumped) and it made me feel really small it just seems anythign in the 16's is tiney...
Btw, 16.5" isn't exactly tiny; it all depends on your structure. Frank Zane's arms were 16.75" in the 1980 Mr. Olympia. They weren't huge by any means but they looked really good.
mine are 20 but they look 16 because I am taller and my chest is big....so the tape measure doesn't mean everything......pretty much what guldukat was saying