Our one of a kind car air fresheners come in a variety of designs and measure approximately 3x2 inches. They come with no scent, so you can add any scent you like, or you may add a scent option of your choice before adding to your cart. If you do choose to add a fragrance, you will receive a 1 ML mini oil dropper filled with one of our amazing fragrance oils with your air freshener. Simply pull the diffuser pad out through the top cut out, add your fragrance to the pad, and slide the pad back into place, or you can drop the oil through the cutouts. You can reuse the pad and refill your bottle with your own fragrance as many times as you wish!