This refillable toy mouse is made from natural hemp with an opening so you can keep your kitty happy with fresh organic catnip. Hemp is a highly renewable resource that grows without pesticides and is biodegradable. The hemp canvas mouse-shaped body and hemp string ears allow the cat's nails to perfectly snag the mouse so that it goes topsy-turvy. Enjoy hours of eco-friendly fun with your cat. Made by folks with handicaps. 4 1/2" in length.