Material: High Quality-This Choke/Dog Training Collar is made of high quality stainless steel. It will never rust, fade, tarnish or break Size: 1.2.5mm*45cm; 2.3.0 mmx55 cm; Fully welded links are certified, ultra strong links.Excellent for smooth control: it can correct dogs unwanted behavior and will stop pulling. Fashionable and personalized designed: nine P their obedience training or walking collars.P Training Starter for doing sports and training your pet, safety to use. Measurement size - Please Use a tape measure to measure the circumference of the soft dog’s neck or the widest part of the head, and the dog chain is better 3-10cm longer than the size of the dog’s neck. (ex. Dog head/neck size is 40cm, suitable chain size for dog is 50cm).