Deters spiders naturally with a formula of essential oils and plant fiber. Spiders do not like the citronella oil, lemongrass oil, and rosemary oil blend that is a pleasant smell to humans. Effective and safe for humans, pets, and the environment. No setup or messy cleanup. Patented pouch design delivers long lasting, slow release of proven essential oils. Ideal for use anywhere indoors where there are spiderwebs or spiders such as basements, closets, or attics.