These reflective dog collars suit medium sized dogs and are available in fluro pink and blue / green with reflective strips. They are a great idea to help keep your dog visible and safe when out walking or any other activity to ensure they are easier to see. The collars are 20 cms with and come with silver buckles and D rings. They suit dogs with neck sizes between 28 cms and 37 cms. I can make the collars longer or shorter on request of I can add more holes to suit a smaller neck size.