Size:adjustable from 7 to 12.5-inch in length, 3/8-inch width<br> Package :5 pcs dog collars<br> Main material:Nylon<br> Application:Small and medium-sized dog<br> Occasion: indoor or outcoor dog collar<br> Note: The dog collars are not breakaway collars!<br><br> It's your best bet to choose this collar set. <br>