Pet Dog Rivet Collar Spiked Studded Strap Faux Leather Buckle Neck Collar Material: Faux Leather, Zinc Alloy XS Size: 30cm x 2.5cm/11.81" x 0.98" (Approx.) S Size: 37cm x 2.5cm/14.57" x 0.98" (Approx.) M Size: 42cm x 2.5cm/16.54" x 0.98" (Approx.) L Size: 51cm x 2.5cm/20.08" x 0.98" (Approx.)