Tag Silencers eliminate the annoying noise created by pet tags (rabies tag, city license, ID tag, etc.). Helps tags last longer, reduces tag noise, and they glow in the dark. Using tag silencers will make life better for you and your dog just look at the following advantages of using them: Tag noise attracts unwanted attention from other dogs! Keeps the information from wearing off the tags Helps eliminate "Tag Tarnish" on the necks of white or light-colored breeds Installs in seconds. No tools necessary Glows in the dark Un-stretched Sm Circle Silencer measures ¾-inch in diameter.