These 100% cotton, eco-friendly, azo free dyed rope toys are great for dogs who have the need to chew on their toys. Keep your dog's teeth and gums clean while promoting better dental health through non-destructive chewing. Choose from festive colors, like: Tangerine, Kiwi, Pink Azalea, Berry Red or Sky Blue. Measures 5.5" long. Why azo free dyes? Azo dyes contain toxic and potentially carcinogenic by-products. (The European Commission has already passed directive 76/769EEC, which bans the usage of certain azo dyes for use in textile or leather products which come come in "direct or prolonged" contact with the skin or mouth.) Azo free dyes are also much easier on the environment. Azo dyes, on the otherhand, resist biodegradation under aerobic conditions, so they are difficult to remove from an ecosystem.