Please limit yourself to 20 pieces per size. We always have more collars on order, it is just slow getting them from Herm Sprenger.
Curogan is a copper tin alloy (will not rust) with a high copper portion and other additives to make the material strong, but without any nickel! Curogan is less likely (but not 100%) to cause discoloration of light colored coats. Dogs that are allergic to nickel should do well with this collar! We would consider this a hypoallergenic option. These collars will darken and tarnish when exposed to the outdoor environment.