This toy is made from netting fabric, which is durable, but friendly for cat to sharpen its claws.It is filled with polyester, also with catnip inside, which has a calming and stress-relieving effect on cats. It is suitable for all kinds of cats to interact and play. It is one of the most crazy toys for cats. Catnip (False Nepeta) is a kind of herb, it smells very cool, it is a kind of plant that can make cats crazy and happy, so it is called "cat drug" by the majority of cat friends. This "drug" is not another "drug". Catnip is an herb that can make cats crazy and happy.