Keeps the refrigerator fresh for months. They also take musty smells out of antiques and odors out of almost anything. The Regular size is for the refrigerator and large size for closets or large cabinet. One of my customers had an antique store and had spent over $30.00 trying to get the odor out of an antique cabinet. After purchasing my Fridge Freshener I stopped by her shop to see if the Fridge Freshener had worked. She was so delighted that she had me come over to the cabinet to smell for myself. All the odors were gone and she could now sell her antique cabinet. See my Testimonials for this product as I get them regularly.