Coastal Pet's Single Nylon Collars care made of high quality nylon that is specially processed to prevent fraying and increase strength. All nylon products are carefully and neatly finished for comfort, appeal and durability. Select the size that fits your big dog, puppy, toy breed, or cat the best. - Pet collars for big dogs, puppies & cats - High quality nylon - Specially processed to prevent fraying & increase strength Measuring Instructions: Measure dog's neck and place 2 fingers between the dog and measuring device for correct length needed. Lengths are based on the measurement from the end of the buckle to the last hole, the largest adjustment. Coastal Pet Coastal Pet Single Nylon Collar - Black: 14" Long x 5/8" Wide Black #40114BK - Nylon Dog Collars - Collar.