The KONG Naturals Straw Cylinder w/ Feathers is designed to cater directly to the innate hunting instincts of your pet. The crinkle sound is immediately curious, and exercise and entertainment are provided by the mixture of natural fur, feathers and catnip. These toys are meant to cater to the need for your cat to stalk and pounce. KONG Naturals are cat toys that are ecologically responsible. The materials and dyes used come from natural, renewable resources.