XS/S - 6mm diameter and ranges from 40-70". Recommended for dogs less than 20 lbs Like new, barely used. Color Slate Walk your dog hands-free Designed with both you and your dog in mind, the Magic Link® can be worn by humans as a belt, a bandolier, or a wrist-strap and it can serve as a slip-on collar or a conventional leash when attached to a separate harness. The Magic Link® is the key to worry-free, hands-free outings with your dog—whether it's coffee in one hand and your phone in the other while your pup leads the way home, or picking up your pooch's poop without fumbling with the leash.