The Cat Calming Pheromone Diffuser Refills by TCLLKA are designed to effectively relieve anxiety in cats. With a 6-in-1 formula, these diffuser refills provide a soothing and calming environment for your feline companion. Made in China, this product lasts for up to 30 days and is easy to use with its diffuser kit design. Give your cat the peace and tranquility they deserve with these pheromone diffuser refills.