S 15-18” 20”(51cm), 5 holes adjustable Beirui Spiked Leather Dog Collar Studded Pitbull Boxer Black for Medium and Large Dogs Beirui dog collars are made of high quality PU leather. They are extreme comfortable, durable,fashionable and personalized designed for your pet. Used ONCE for a photoshoot for my dog. I wiped down the inside after use. Practically new condition. Pattern Dog Color Black Material Faux Leather Brand Berry Pet Closure Type Pull On