Kaytee Knot Nibbler is a ball of fun for small animals. Pets will nibble and gnaw this wooden chew toy to reach an all natural surprise inside - a wooden ball! Knot Nibbler is made from all natural wood and safe vegetable food colors, making it a perfect chew toy for rabbits, guinea pigs, hamsters, gerbils, chinchillas, pet rats, and other critters! Size: 4" x 4" x 3.5".