The Kaytee Medium Nut Knot Nibbler is a colorful play toy for Small Animals that is safe to chew. Your pet will have hours of fun chewing and gnawing to get to the nut treat that is trapped in the center. The 100-percent natural wood has safe vegetable dye coloring to encourage healthy playing and chewing. Perfect for rabbits, guinea pigs pet rats, hamsters, mice, gerbils and other small animal pets.