Take yourself back to Grandma's kitchen with the aroma of freshly baked Blueberry Muffins. These refillable air fresheners are perfect for hanging in your car or closet. They are filled with 1/4 oz of pure fragrance oil with no harmful chemicals. Each air freshener comes with a card explaining how to use and precautions when using. Simple to use. Remove the stopper and turn upside down. Based on how strong you want the scent will determine how often you flip the air freshener over. Once it is empty, refill with one of our 1 oz. bottles of pure fragrance oils. Most of our offerings are our unique blends of fragrance. Each bottle is labeled per scent. Four different varieties of bottles.