MATERIAL: Made of high quality stainless steel and chrome plated, for durability and rust resistance. Heavy duty chain links, strong enough for large aggressive dogs. GENTLE AND EFFECTIVE TRAINING: The Mighty Paw Martingale Style Training Collar is the safest and gentlest alternative to collars standard chokes while training your pup not to pull or wander while walking. INSTRUCTOR RECOMMENDED: Professional trainers recommend the use of a martingale-type training collar instead of a standard choke collar, due to its controlled force, which puts less strain on your dog's neck. STYLISH: Made of rustproof chrome steel and shiny silver, your dog looks so cool and distinguished, High quality materials and high craftsmanship ensure this choke collar will not tarnish or break. APPLICATION: Perfect tools for animal training. Corrects bad dog behavior, corrects leash pulling and helps teach reactive walking habits, recommended for professional dog obedience training or walking, ideal for aggressive pedigree dogs like the German Staffordshire Shepherd Pit Bull Burrow, etc.