The Feliway Classic Diffuser Refill is a 48ml cat constant calming product that helps provide a sense of security and well-being for cats. Designed by the trusted brand Feliway, this refill pack includes two bottles of their classic calming solution. Ideal for pet owners looking to create a calm and relaxing environment for their feline companions, this product is easy to use and effective in promoting a sense of comfort and tranquility in cats.