ADJUSTABLE SIZE - Length 23.6 inches (60cm) and diameter 0.16 inches (4mm), fit dogs with neck circumference of 18&quot;-22&quot;. Each spike can be detached(removed) to adjust the whole length.<br /> <br /> SAFE AND HARMLESS - This dog collar trainer is a safe and humane way to stop your dog barking. It&#39;s effective and safe with no side effects, no electric shock, or hurt to your pets. The dog training collar can help you teaches your dog obedience and basic commands.<br /> <br /> STRONG AND RELIABLE - Pet training collar stylish design with metal buckle reinforces the fastness, offering easy on and easy off in a second.<br /> <br /> CORRECT TRAINING - The prong collar for dogs can help you teaches your dog obedience and basic commands. Dog prong training collar is designed to provide necessary stress training. No need to scream at a dog or punish it. Just pull the dog pinch choke collar and dog will stop immediately. It&#39;s effective and safe with no side effects, no electric shock, or hurt to your pets.<br /> <br /> QUALITY ASSURANCE - Focuses on pet products, our mission is to let all pet owners enjoy every second with their pets.