Generic Adjustable Puppy Pet Dog Cat Spiked Studded PU Leather Small Dog Collar spikes Material: PU leather / Faux Leather/ man-made leather With Rivet Stronger enough and softer not stiff Hand stitched for added strength S code : 2.5cm*37cm / 0.98"X14.57" M code: 2.5cm*42cm / 0.98"X16.54"