This pack holds four Little Trees Tropical Fiber Cans. Little Trees Fiber Can is a small canister air freshener made using 50% recycled Little Trees fibre. It combines the brand's fragrance technology with a compact can that sits in a cup holder, on the dashboard shelf, under a seat or on a shelf at home. Little Trees rates each can at up to 60 days of fragrance, although temperature and airflow affect how long and how strongly it lasts. The fragrance meets or exceeds the International Fragrance Association guidelines and the cans are made in the USA. Besides the car, it works well in laundry rooms, garages, bathrooms and pet areas.