The Herm Sprenger Martingale Style Pinch Collar features the same stainless steel construction that is the choice of many K9 professionals for its high-strength, corrosion resistance, easy cleaning and hygienic qualities. The very popular Herm Sprenger stainless steel martingale style dog collars or live pinch dog collars are now available in a black finish, reducing glare or shine and appearing to have a lower profile by blending in with many coats easier. Link prongs measure either 3mm or 4mm in diameter. Available in 23 inch length but easily made shorter or longer by removing or adding links.