1. Sturdy and Thick Premium Material: The Vicyuns tactical dog collar is designed with super strong nylon and thickened premium material for longer life. Bulldog, German Shepherd, Lab, French Bulldog, Beagle, Golden Retriever, Husky, Doberman Pinscher, Rottweiler and other small to medium large dogs. 2.Comfortable: We use soft inner lining as inner layer. The outer layer is made of sturdy nylon with two reflective lines. The 2 finger width mounting clearance won't give your dog any pain with this comfortable dog collar. 3.Super Strong Metal D Ring and Safety Buckle: This D ring and buckle adopts the latest super alloy technology, this heavy metal is not easy to collapse. Durability and safety are our primary goals. Two additional sticker patches help create a subtle emotional connection with your puppy. 4. The new tactical handle is designed to better control your dog's movement and keep it safe. In daily training, you can better control his movements and give guidance. The size is adjustable, there are three choices of medium, large and extra large.