Fresh Air. The fragrant Niki figure is a designer car fragrance with a replaceable cartridge made from perfumed rubber, containing special essential oils that will scent your vehicle for 30 days. It combats unpleasant odors, such as cigarette smoke, and pleasantly refreshes the air. It does not contain alcohol. Simply insert the figure into the car's air vent using the clip on its back. Once used up, the cartridge can be easily replaced with the same or a different fragrance.