Stainless Steel High Strength Prong Collar They will never rust. If you want the best for your dog you can purchase one of ourHand made leashesand an imported Herm Sprenger stainless steel collar Stainless Steel fur savers come in the following sizes: 20", 21", 23", 25", 27", and 29". The collar must be big enough to slip over the dogs head and ears.