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.
Available sizes: Small 2.25 mm 16", or Large 3.2mm 23"