Martingale Genuine Black Double Ply Leather Dog Collar Choker Medium to Large Fits 17.5"-21" Neck. The beauty of real leather - soft, strong, durable, and light. Features nickel-plated hardware, heavy duty D-ring, and 6 metal-enforced adjustment eyelets. Trimmed with thick waxed thread and riveted for extra strength. 1" wide double ply leather, 0.25" thick Will fit 17.5"- 21" neck - please measure dog's neck before you order