The KONG Naturals Straw Ball w/ Feathers is specifically designed to appeal to your cat's natural hunting instincts. The crinkle sound instantly sparks curiosity - and the combination of natural fabric, feathers and catnip provide exercise and entertainment. These toys are designed to appeal to the your cat's desire to stalk and pounce. KONG Naturals are ecologically responsible cat toys. The materials and dyes used come from natural, renewable resources.