The ONA Block is ideal for small areas such as closets, foyers, attics, cars, gym bags, boats, kitchens, garbage cans, cupboards or vents. Simply remove the cap, or punch several small holes in the cap and place in desired location. The ONA Block measures 3" x 3" and will fit in most places.The ONA Block will release its powerful odor neutralizing agent and keep the location free from undesirable odors. Replace as necessary.Available in our popular scents: Fresh Linen, Polar Crystal, PRO and all-new Apple Crumble! New Scent "Apple Crumble". The ONA Gel is our most popular product. We spent many years developing a blend of ONA Liquid and various suspension elements to result in a product that has excellent dispersion qualities. The ONA odor neutralizing agents are released in a controlled manner so that every drop of this excellent product is fully optimized.