These are single tickets - for a return trip please buy 2 tickets.
This is a single ticket to travel from any station within zone 1 to Versailles-Rive Gauche station or vice versa. You can start your journey from any Metro/RER station within zone 1 to catch the RER C (you can change to the RER C line at various stations - Bibliotheque F.Mitterrand, Gare D'austerlitz, St-Michel Notre Dame, Mus�e d'Orsay, Invalides, Pont de l'Alma, Champ de Mars Tour Eiffel, Javel and Boulevard Victor) or from any station on the RER C line between the stops of Bibliotheque F. Mitterrand and Versailles-Rive Gauche.
Please note: If you decide to physically leave the underground system during your journey, your ticket will no longer be valid.