AOLOVE Rivet Spiked Studded Padded Genuine Leather Pet Collars for Medium or Large Dogs Medium size: 1"*16.5"(2.5cm*42cm),Neck 11.8-15.3"(30-39cm) / Please check the size before you confirm the order Material: Genuine Leather + Alloy 5 adjustment holes for adjustment Strong and durable high quality Genuine leather,Nickel-plated hardware and heavy duty D-ring to help protect its neck Fashionable and personalized designed for your pet