Help your feline friend find peace and relaxation with Tranquil Tails Vanilla Purr-Fection Calming Pheromone Diffuser Refill Pads for Cats. These pads are specifically designed for use in the Tranquil Tails Waterless Aromatic Pheromone Vaporizer Diffuser (sold separately). When used in the vaporizer, they release a calming blend of essential oils and pheromone isolates that help soothe anxious furbabies. Perfect for easing stress caused by separation, thunderstorms, fireworks, or other stressful times. With these pads, your kitty can stay calm, and you can relax.