Brand new with tags. Hypoallergenic Nickel Free No-Pull Collar for Dogs Made in Germany. Curogan Training Prong Collar: Curogan is a copper and tin alloy. It does not contain nickel, thus making it a good choice for dogs who are allergic to nickel. This professional training dog collar comes with two O rings Size: 23 inches (58cm) by 3.2mm wire gauge overall collar length, will fit dogs with the neck size of Up To 20 inches Removable Links: Slightly beveled prong tips. Interlocking links, each link equipped with two blunt prongs. Links can be added to make the collar longer or removed to make it shorter. Collar should fit snuggly just below the dog's ears, measure the circumference of dog's neck and add 3 inches Made in Germany: You can always expect highest quality collars which are made in Germany by Herm Sprenger Will Not Rust: Curogan will not rust but due to high copper content, the material can darken over time. This can be easily solved by using metal polish and it will look new again