Material:Nylon 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 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 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 SIZE: Small 2.5cm Width, Adjustable Length 30-37cm. Medium 3cm Width, Adjustable Length 37-45cm . Large 3cm Width, Adjustable Length 43-50cm. X-Large 3cm Width ,Adjustable Length 48-55cm. Suitable for puppy, small, medium and large dogs