Herm Sprenger Ultra-Plus Prong Training Collar HERM SPRENGER PRONG COLLAR: Safe, effective dog training tools with proper use; Fits dogs with an up to 12-inch neck DOG PRONG COLLAR: High-quality, steel chrome plated PRONG COLLAR: Safety ends for safety of dog and owner; Center plate allows for even pressure/correction; Similar usage to a pinch collar for dogs PRONG COLLARS FOR DOGS: Also available in Medium Size (3.0 mm x 16"), Heavy Size (3.25 mm x 18") and X-Heavy Size (3.8 mm x 20") HERM SPRENGER: Made in Germany