Metal collars crafted by Herm Sprenger are a symbol of quality and reliability. Made in Germany, the large collection of collars are popular with dog trainers and behavior training specialists. Herm Sprenger Training Collars are available in different finishes: steel, chrome-plated steel, stainless steel, anodized black stainless steel, and curogan. Curogan is an alloy created for dogs with a nickel sensitivity; curogan will not stain fur. Please note that Herm Sprenger collars are made with metric measurements. The manufacturers sizing is converted to rounded non-metric measurements for easy searching. Training Collar Only: All users of training collars/devices should be informed in how to use training collars/devices. Do not use retractable leash devices or elastic/tension leads with training collars.