Dogs Kingdom Faux Leather Spiked Studded Dog Collar pet collar Pitbull, Boxer Material: high quality PU leather ,strong enough, soft and not stiff,skin friendly. Nickel-plated hardware and heavy duty D-ring Size:XS:Overall length 20", will fit 14.5"-17.5" neck; S:Overall length 22.5", will fit 17"-20" neck; M:Overall length 24", will fit 19"-22" neck; L:Overall length 26", will fit 21"-23" neck. 5 adjustment holes Kindly Please check the neck size of your pet before your order.