Some operators offer points for usage, exchanged at retailers or for other benefits. Card users may also make small purchases using the cards. Smart cards, used as transit passes, and integrated ticketing are used by many public transit operators. Smart cards are typically made of plastic, generally polyvinyl chloride, but sometimes polyethylene-terephthalate-based polyesters, acrylonitrile butadiene styrene or polycarbonate.Communicates with external services through card-reading devices, such as ticket readers, ATMs, DIP reader, etc.Managed by an administration system, which securely interchanges information and configuration settings with the card, controlling card blacklisting and application-data updates.Contains a tamper-resistant security system (for example a secure cryptoprocessor and a secure file system) and provides security services (e.g., protects in-memory information).Both are 0.76 millimetres (0.030 in) thick. Another popular size is ID-000, which is nominally 25 by 15 millimetres (0.98 in × 0.59 in) (commonly used in SIM cards). ID-1 of the ISO/IEC 7810 standard defines cards as nominally 85.60 by 53.98 millimetres (3.37 in × 2.13 in).
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