WIDE APPLICATION: As a training collar for leash walking, ideal for training and controlling pulling, perfect for obedience and behavioral correction in puppies, new dogs and aggressive walkers. Collie, labrador, french bulldog, rottweiler puppy, doberman, american bully would like this silver metal collar. GENTILE TIGHTEN UNDER TENSION: Our semi-choke chain collar fits loosely on a dog’s neck, but can be tighten when dogs pull. Excellent for maintaining control and keeping your dog safe on leash, useful for training good behaviors. LESS PRESSURE MORE SAFETY: This anti chew heavy duty martingale dog collar with less pressure than standard choke collar, gentle but effectively to control dog pulling because of half choker dog collar. STRONG ANTI CHEW MARTINGALE COLLAR FOR DOGS: Chrome-plated one row chain without sharp points or rough edges to chafe skin or snag fur. Please keep drying after using to avoid rusty. Strong resistant to anti break and tarnish. SIZE AVAILABLE: HAPPY HACHI chain collar is available in 3 different lengths and diameters, ranging from 30-67 cm, each size has 10 cm adjustable fits. Suitable for for medium large dogs who pull, bite when training or walking. Please measure your dog’s head and neck to choose the proper size.