Ruffin' It prong training collar is designed with interlocking links with blunted open end prongs turned towards the dog's neck. The design of the prong collar is such that it has a limited circumference, unlike choke chains which do not have a limit on how far they can tighten on a dog's neck. The collar is designed to prevent the dog from pulling while on a leash. The prong collar does not pinch the skin. Size: 24".