These collars come in: * 1" Ring-N-Center Collar * 1" Extended-D Collar * 3/4" Ring-N-Center Collar * 3/4" Extended-D Collar. Designed for maximum visibility. Sewn onto the sturdy, double-ply nylon collar is a band of fluorescent Reflexite. Hardware is heavy-welded and nickel-plated with the curved canine buckle for a comfortable fit. Ideal for night hunting, pre-dawn and dusk when visibility is low. New white Reflexite collar is brightest of all - excellent for use at night. Free nameplate available with each collar ordered. When you select these collars, you will be guided at checkout for engraving information. To select collar size: Measure dog's neck and add four inches. Example: 17" neck will need a 21" collar