This Feliway Diffuser Refill is a safe solution of feline facial pheromone, which mimics the cat's natural pheromones, creating a state of comfort and calm. When a cat feels safe in its environment it rubs the area between the side of its face and its chain against the furniture, corners of walls or the bottom of curtains, depositing facial pheromones.Feliway emits a synthetic form of these pheromones, helping to calm and soothe cats during stressful or anxious times, such as visits to the vet, moving house or the rearrangement of furniture, naturally conveying a message of safety and well-being.