Euro coins are produced using advanced technology. For this reason, they incorporate high-security machine-readable characteristics, making it difficult to counterfeit them. They can be used in vending machines throughout the euro area - no matter where they were issued.
With a sophisticated production process, the highest value coins (€1 and €2) use bi-metal and sandwich technologies, giving them special magnetic properties. The €2 coin has fine lettering around the edge which is different for each country. The 10, 20, and 50 cent coins are made of a unique alloy "Nordic gold" which is difficult to melt down and is used exclusively for coins.