The Mighty Paw Martingale-Style Limited Cinch Collar is designed to make training with your dog safe and effective. The traditional choke collar is aggressive and uses uncontrolled force to correct negative behaviors. The Mighty Paw martingale-style collar tightens under tension but only tightens enough to provide a (subtle) controlled training cue to your dog. The endorsed by thousands of trainers, this collar is preferred because of its gentle nature and extreme effectiveness.