AOLOVE Rivet Studded Adjustable PU Leather Pet Collar with Cool Skull Studded for Medium Large Dogs Please check your pet's exact neck size before you confirm the order / Medium size: 1.26"*20"(3.20cm*51cm), Neck 14.5-18.5"(37-47cm) / Large size: 1.26"*22"(3.20cm*56cm), Neck 16.5-20.5"(42-52cm) Material: PU Leather + Alloy 5 adjustment holes for adjustment Strong and durable high quality PU (Faux) leather,Nickel-plated hardware and heavy duty D-ring to help protect its neck Fashionable and personalized designed for your pet