Scented Tarts are used in either electric or tea light warmers.  The tarts are then placed onto the warming plate one at a time.  When the device is warmed the tart melts and releases the scent.  Tarts come in packages of six, all of the same scent.  We have over 100 scents to choose from. Unfortunately we do not mix and match tart scents at this time.  Each warm tarts scent will last between 6-8 hours.