Herm Sprenger Black Stainless Steel Prong Collar with Buckle for Dogs, 3.2mm Large Herm Sprenger Ultra Plus Model 50007-57 / 50057 | Prong Training Collar | Anodized Black Stainless Steel | (10) 3.2 mm Prong Links | ClicLock | Canvas billets | D-Ring Center plate assembly from which five (5) prong links are linked on both sides of center plate with prong links placed directional toward center plate, placing even pressure on the neck sides and not on the trachea; Prong ends are beveled and polished; ClicLock snap buckle with D ring for lead attachment; Buckle design easy to use by those with compromised hand dexterity Manufacturer factory assembled size fits neck size up to approximately 17 to 18 inches depending on fur type and fur depth; Prong links can be added and removed to adjust fit; Additional prong links can be purchased separately Manufacturer recommends this collar for dogs with maximum weight of 40 kg or approximately 88 pounds; Read Product Description for additional instructions for sizing, fit, and care Made in Germany, authenticity is verified by the embossed logo on the center plate, specific rings, and junction components