51604(55) Stainless Steel Fur Saver Dog Collar 1/6 Inch (4.0 mm) (Made in Germany) - Size 23 Inch (59 cm) for Dogs with Neck Size of 20-21 Inch (50-53 cm) by Herm Sprenger Corrosion resistance Extra strong Does not cause allergies and irritations Spare dogs from fur problems like knotting, pulling All rings are correspondingly stamped