Naphthalene balls are used as insecticides, germicides, and moth repellents.
They are commonly placed in wardrobes, bathrooms, and bookshelves to protect clothes and other items from pests like moths and cockroaches.
The balls release a strong odor from naphthalene vapors, which disrupts the metabolism of insects and eventually kills them.
They can also be used to control foul odors in toilets and washrooms.