The subway pass — a small, rectangular ticket composed mainly of stiff paper — lists the period of time and the zones for which it is valid, as well as its price. At the top of the front side of the ticket, there is a thin, holographic strip, to prevent counterfeiting. On the reverse side, there is a brown, magnetic strip on which the card's data (zones and dates) are stored. The user feeds the Carte orange ticket into a turnstile upon entering a metro station, and the machine, after reading the ticket, returns it to the user. A weekly Carte Orange is valid only for one seven-day period, always starting on Monday and ending on Sunday.