Titan's training collars feature rounded ends for safety. To put the collar on the dog, simply unfasten one of the links, hold around your dog's neck and fasten the link again. There are four different sizes, but should you dog have a wider neck, you can simply add more links. To increase the comfortability you can also add comfort tips without sacrificing any correction. The collar parts are chrome plated for maximum strength and withstand rust, tarnish or break.