This pack contains 10 Little Trees Supernova hanging air fresheners, the original cardboard tree that has been freshening cars since 1952. Handy for keeping one in each vehicle and a few around the house. The Supernova fragrance is bursts of bright bergamot intensified by notes of dark berry, ozonic florals and musk. Each tree is printed on premium specialty paper and sealed in a film wrapper that keeps the scent locked in until you need it. To use it, cut a V at the top of the wrapper and pull the tree out a little at a time over about seven weeks, which releases the fragrance gradually instead of all at once. Hang it from the mirror, a hook or a coat hanger with the elastic string. Besides cars, the trees work well in small spaces such as laundry rooms, garages, bathrooms, cupboards and areas with pet odours. Little Trees says its fragrances meet or exceed the International Fragrance Association guidelines, and the trees are made in the USA. Keep it from touching plastic or painted surfaces in the car.