Short section metro ticket for up to 3 stops
Valid on the metro network (M1, M2, M3 and M4) for a single short trip of up to 3 stops for a period of 30 minutes after validation. Trip interruptions and return trips are not permitted. During the period of validity transfers are allowed between metro lines M1, M2, M3 and M4 but only for a total of 3 stops. Please show and hand over your ticket if requested by the inspector.
Please find more information here on the refund rule.