Tranquil Tails Woodland Whiskers Calming Pheromone Diffuser Refill Pads for Cats are specifically designed for use in the Tranquil Tails Waterless Aromatic Pheromone Vaporizer Diffuser (sold separately). These pads are the perfect solution for pet parents looking to soothe their anxious feline friends. When used in the vaporizer, the pads disperse a calming blend of essential oils and pheromone isolates to help ease stress caused by separation, thunderstorms, fireworks, or other stressful situations. With your kitty feeling calm and relaxed, you can also enjoy some peace of mind.