I always trust herm sprenger collars on my k9's whether they are police dogs or sport dogs, i know i can trust the quality that herm sprenger delivers. Herm Sprenger not only has a strong, reliable product, but delivers a prong collar that is second to none. not only is it safe and effective for your dog, it is manufactured at the highest level of quality. i have owned my current herm sprenger collar for the last 12 years and have used the same collar on two police dogs and my current sport dog.