Question: how big is 1 cent euro coin?
Answer: The coins are composed of copper-covered steel, with a diameter of 16.25 mm, a 1.67 mm thickness and a mass of 2.30 grams. The coins' edges are smooth. The coins have been used from 2002, though some are dated 1999 which is the year the euro was created as a currency, but not put into general circulation.