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 will avoid 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.