SIZE: X-Small Width 1.5cm, Neck Size 20-30cm. Small Width 2cm, Neck Size 30-40cm. Medium Width 2.5cm, Neck Size 35-50cm. Large Width 2.5cm, Neck Size 40-60cm. X-Large Width 3cm, Neck Size 45-70cm. Suitable for puppy, small, medium and large dogs. CONVENIENT: For quick release, the buckles are made of ABS plastic. The buckles allow the collar to adjust around the neck of the dog for ultimate comfort. CLASSIC: This nylon dog collar is a classic yet stylish collar that comes in 12 colors and 5 sizes so you can find just the right one for your dog. A separate loop on the collar makes it easy to add dog tags and leads onto the collar. MATERIALS: Dog collar is made of nylon with thick neoprene padding on the back, making it soft. This prevents any irritation on the neck and makes it an all-weather dog collar. SAFETY: Highly reflective threads keep high visibility at night for safety. And you can easy find your furry pet in the back yard at night.