Euro coins edge of the €2 coin also protects it from counterfeiting. Euro coins were designed in cooperation with organisations representing blind persons, and as a result they incorporate many features allowing them to be distinguished by touch alone. In addition, their visual appearance is designed to make them easy to tell apart for persons who cannot read the inscriptions on the coins. The coins increase in size and weight with value. Of the eight denominations of euro coins, the three lowest denominations are small, resemble copper in colour and are quite thin and light. The next three denominations resemble gold in
Sammarinese euro coins such as the 2014 €5 coin dedicated to three-time Formula One World Champion Ayrton Senna in 2014, being 20 years from Senna's fatal crash at the San Marino Grand Prix. This coin was also complemented by a commemorative €2.50 stamp. Sammarinese euro coins Sammarinese euro coins feature separate designs for every coin. All the coins are inscribed with the words "San Marino" and the twelve stars of the EU. The Sammarinese euro coins are minted by Istituto Poligrafico e Zecca dello Stato (IPZS), in Rome, Italy. For images of the common side and a detailed description of the coins, see