ColorfulZanies Knotted Rope Bones are a great way to satisfy a dog’s urge to chew. Natural cotton rope dyed with vegetable dyes creates colorful, long-lasting toys in a variety of sizes and shapes that dogs will love. Toys are not only fun to play with, they also help keep dog's teeth and gums clean and healthy! Available in 8.5", 10", 14", 18", and 16" Big Dog sizes.