The Herm Sprenger prong collar is one of the most recognizable and
popular names in obedience training tools. A safe and effective
alternative to choker collars, the prong collar puts even pressure
around the neck, about every half inch, pinching the skin in a
band. This collar does not apply direct pressure to the trachea so you
can train your dog with little or no tugging, jerking, or pulling. Made
of high-quality German steel and adjustable size, just add or remove the
chrome plated links individually.