Naphthalene mothballs are small, white, solid balls that are used to repel moths and other insects. They are made from the chemical compound naphthalene, which emits a strong odor that repels moths and other insects. Naphthalene mothballs are typically used to protect clothing and other textiles from damage caused by moth larvae, which feed on natural fibers such as wool and silk. To use, the mothballs are placed in a storage container or closet with the textiles to be protected. The strong odor of the naphthalene evaporates over time and forms a protective barrier around the textiles, preventing moth larvae from infesting and damaging them.